Antimicrobial compounds, compositions, and uses thereof

ABSTRACT

A method of treating an infection of at least one of a wound or a ulcer in a patient in need thereof according to an embodiment includes administering to the patient an effective amount of a compound having the formula:or a pharmaceutically acceptable salt thereof.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of U.S. patent application Ser. No. 16/941,627 filed Jul. 29, 2020, which is a continuation of U.S. patent application Ser. No. 16/505,497 filed Jul. 8, 2019 and issued as U.S. Pat. No. 10,752,651, which is a continuation of U.S. patent application Ser. No. 15/919,138 filed Mar. 12, 2018, which claims priority to U.S. Provisional Patent Application Ser. Nos. 62/470,025 and 62/470,039 filed on Mar. 10, 2017, each of which is incorporated by reference herein in its entirety.

FIELD

The present disclosure provides novel antimicrobial compounds and compositions and uses thereof.

BACKGROUND

Bisphosphocin® compounds have antimicrobial activity. U.S. Pat. No. 7,868,162 discloses Bisphosphocin® compounds.

SUMMARY

The present disclosure provides a method of treating an infection of at least one of a wound or an ulcer in a patient in need thereof. The method may include administering to the patient an effective amount of a compound having the formula:

or a pharmaceutically acceptable salt thereof.

In some embodiments, the administration may be topical administration.

In some embodiments, the administration may be carried out using the compound, or a pharmaceutically acceptable salt thereof, in a lotion, paste, gel, cream, ointment, oil, or other viscous composition.

In some embodiments, the administration may be carried out using the compound, or a pharmaceutically acceptable salt thereof, in a powder, solution, or suspension.

In some embodiments, the patient may be administered at least one additional active ingredient.

In some embodiments, the administration may be carried out as a multiple dose regimen.

In some embodiments, the multiple dose regimen may be a time period of up to about 7 days.

In some embodiments, the multiple dose regimen may be a time period of up to about 14 days.

In some embodiments, the multiple dose regimen may be a time period of up to about 21 days or up to about one month.

In some embodiments, the administration may be carried out as a chronic treatment regimen.

In some embodiments, the administration may be carried out one or more times per day.

In some embodiments, the amount of the compound, or a pharmaceutically acceptable salt thereof, administered to the patient may be from about 0.1 to about 1000 milligram (mg) of the compound, or a pharmaceutically acceptable salt thereof, per kilogram (kg) of patient body weight.

In some embodiments, the amount of the compound, or a pharmaceutically acceptable salt thereof, administered to the patient may be from about 0.1 to about 500 mg of the compound, or a pharmaceutically acceptable salt thereof, per kg of patient body weight.

In some embodiments, the amount of the compound, or a pharmaceutically acceptable salt thereof, administered to the patient may be from about 0.1 to about 300 mg of the compound, or a pharmaceutically acceptable salt thereof, per kg of patient body weight.

In some embodiments, the amount of the compound, or a pharmaceutically acceptable salt thereof, administered to the patient may be from about 0.1 to about 200 mg of the compound, or a pharmaceutically acceptable salt thereof, per kg of patient body weight.

In some embodiments, the amount of the compound, or a pharmaceutically acceptable salt thereof, administered to the patient may be from about 0.1 to about 100 mg of the compound, or a pharmaceutically acceptable salt thereof, per kg of patient body weight.

In some embodiments, the patient may be a human.

In some embodiments, the pharmaceutically acceptable salt may be a sodium salt.

In some embodiments, the sodium salt may be sodium ((2R,3S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-3-((butoxyoxidophosphor-yl)oxy)tetrahydrofuran-2-yl)methy 1 butyl phosphate.

In some embodiments, the wound may be a burn wound.

In some embodiments, the ulcer may be a diabetic foot ulcer.

Additional aspects and embodiments will be apparent from the Detailed Description and from the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

The concepts described herein are illustrative by way of example and not by way of limitation in the accompanying figures. For simplicity and clarity of illustration, elements illustrated in the figures are not necessarily drawn to scale.

FIG. 1 shows a decrease in CFU burden (in thousands) for mice treated with Nu-8 forumlated in saline solution or Nu-8 formulated in hydrogel compared to control according to an embodiment.

FIG. 2 shows a decrease in CFU burden (in log value) for mice treated with Nu-8 forumlated in saline solution or Nu-8 formulated in hydrogel compared to control according to an embodiment.

FIG. 3 shows a decrease in CFU burden (in residual percentage) for mice treated with Nu-8 forumlated in saline solution or Nu-8 formulated in hydrogel compared to control according to an embodiment.

DETAILED DESCRIPTION

The embodiments described below are not intended to be exhaustive or to limit the invention to the precise forms disclosed in the following detailed description. Rather, the embodiments are chosen and described so that others skilled in the art may appreciate and understand the principles and practices of this disclosure.

References in the specification to “one embodiment,” “an embodiment,” “an illustrative embodiment,” etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may or may not necessarily include that particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. It should be further appreciated that although reference to a “preferred” component or feature may indicate the desirability of a particular component or feature with respect to an embodiment, the disclosure is not so limiting with respect to other embodiments, which may omit such a component or feature. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to implement such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described. Additionally, it should be appreciated that items included in a list in the form of “at least one of A, B, and C” can mean (A); (B); (C); (A and B); (B and C); (A and C); or (A, B, and C). Similarly, items listed in the form of “at least one of A, B, or C” can mean (A); (B); (C); (A and B); (B and C); (A and C); or (A, B, and C). Further, with respect to the claims, the use of words and phrases such as “a,” “an,” “at least one,” and/or “at least one portion” should not be interpreted so as to be limiting to only one such element unless specifically stated to the contrary, and the use of phrases such as “at least a portion” and/or “a portion” should be interpreted as encompassing both embodiments including only a portion of such element and embodiments including the entirety of such element unless specifically stated to the contrary.

The present disclosure provides a compound having the formula:

or a pharmaceutically acceptable salt thereof.

The chemical name of the compound of Formula (I) is sodium ((2R,3S,5R)-5-(4-amino-2-oxopyrimidin-1 (2H)-yl)-3-((butoxyoxidophosphor-yl)oxy)tetrahydrofuran-2-yl)methyl butyl phosphate. The molecular formula of the compound of Formula (I) is C₁₇H₂₉N₃Na₂O₁₀P₂. The molecular weight of the compound of Formula (I) is 543.11 Da. The compound of Formula (I) is also referred to herein as Nu-8 or Compound (I), which such terms are used interchangeably herein. In some embodiments, a compound of the present disclosure includes a ribose, two phosphate groups, two butyl groups, and a cytosine.

The compound of Formula (I) is described with reference to the specific compound illustrated herein. In addition, the compound of Formula (I) may exist in any number of different forms or derivatives, all within the scope of the present disclosure. Alternative forms or derivatives, include, for example, pharmaceutically acceptable salts, prodrugs and active metabolites, tautomers, and solid forms, including without limitation different crystal forms, polymorphic or amorphous solids, including hydrates and solvates thereof, and other forms.

Unless specified to the contrary, specification of the compound of Formula (I) herein includes pharmaceutically acceptable salts of such compound. Thus, the compound of Formula (I) can be in the form of pharmaceutically acceptable salts or can be formulated as pharmaceutically acceptable salts. Contemplated pharmaceutically acceptable salt forms of the present disclosure include, without limitation, mono, bis, tris, tetrakis, and so on. Pharmaceutically acceptable salts of the present disclosure are non-toxic in the amounts and concentrations at which such pharmaceutically acceptable salts are administered. The preparation of such pharmaceutically acceptable salts of the present disclosure can facilitate the pharmacological use by altering the physical characteristics of a compound of the present disclosure without preventing it from exerting its physiological effect.

As used herein, the term “pharmaceutically acceptable,” with respect to salts and formulation components such as carriers, excipients, and diluents, refers to those salts and components which are not deleterious to a patient and which are compatible with other ingredients, active ingredients, salts or components. Pharmaceutically acceptable includes “veterinarily acceptable,” and thus includes both human and non-human mammal applications independently.

As used herein, the term “pharmaceutically acceptable salt” refers to salts commonly used to form alkali metal salts and to form addition salts of free acids or free bases. Such salts include, for example, the physiologically acceptable salts listed in Handbook of Pharmaceutical Salts: Properties, Selection and Use, P. H. Stahl and C. G. Wermuth (Eds.), Wiley-VCH, New York, 2002, which are known to the skilled artisan. Salt formation can occur at one or more positions having labile protons. The pharmaceutically acceptable salts of a compound of the present disclosure include both acid addition salts and base addition salts.

In some embodiments, suitable pharmaceutically acceptable acid addition salts of the compounds of the present disclosure may be prepared from an inorganic acid or an organic acid. Examples of such inorganic acids include without limitation hydrochloric, hydrobromic, hydroiodic, nitric, carbonic, sulfuric, and phosphoric acid. Appropriate organic acids include without limitation aliphatic, cycloaliphatic, aromatic, arylaliphatic, heterocyclic, carboxylic, and sulfonic classes of organic acids, examples of which are formic, acetic, propionic, succinic, glycolic, gluconic, maleic, embonic (pamoic), methanesulfonic, ethanesulfonic, 2-hydroxyethanesulfonic, pantothenic, benzenesulfonic, toluenesulfonic, sulfanilic, mesylic, cyclohexylaminosulfonic, stearic, algenic, beta-hydroxybutyric, malonic, galactic, and galacturonic acid, to name a few. Pharmaceutically acceptable acidic/anionic salts also include, the acetate, benzenesulfonate, benzoate, bicarbonate, bitartrate, bromide, calcium edetate, camsylate, carbonate, chloride, citrate, dihydrochloride, edetate, edisylate, estolate, esylate, fumarate, glyceptate, gluconate, glutamate, glycollylarsanilate, hexylresorcinate, hydrobromide, hydrochloride, hydroxynaphthoate, iodide, isethionate, lactate, lactobionate, malate, maleate, malonate, mandelate, mesylate, methylsulfate, mucate, napsylate, nitrate, pamoate, pantothenate, phosphate/diphospate, polygalacturonate, salicylate, stearate, subacetate, succinate, sulfate, hydrogensulfate, tannate, tartrate, teoclate, tosylate, and triethiodide salts, among others.

In some embodiments, suitable pharmaceutically acceptable base addition salts of the compounds of the present disclosure include without limitation metallic salts made from aluminum, calcium, lithium, magnesium, potassium, sodium and zinc, or organic salts made from N,N′-dibenzylethylene-diamine, chloroprocaine, choline, diethanolamine, ethylenediamine, N-methylglucamine, lysine, arginine, and procaine. All of these salts may be prepared by conventional means from a compound of the present disclosure by treating a compound of the present disclosure with the appropriate acid or base. Pharmaceutically acceptable basic/cationic salts also include diethanolamine, ammonium, ethanolamine, piperazine and triethanolamine salts, to name a few. In some embodiments, a pharmaceutically acceptable salt of the present disclosure comprises a monovalent cation or a divalent cation.

In some embodiments, a pharmaceutically acceptable salt of the present disclosure is selected from the group consisting of an ammonium salt, a calcium salt, a sodium salt, a potassium salt, a magnesium salt, and a cobalt salt. In some embodiments, the ammonium salt is ammonium ((2R,3 S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-3-((butoxyoxidophosphor-yl)oxy)tetrahydrofuran-2-yl)methyl butyl phosphate. In some embodiments, the calcium salt is calcium ((2R,3 S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-3-((butoxyoxidophosphor-yl)oxy)tetrahydrofuran-2-yl)methyl butyl phosphate. In some embodiments, the sodium salt is sodium ((2R,3 S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-3-((butoxyoxidophosphor-yl)oxy)tetrahydrofuran-2-yl)methyl butyl phosphate. In some embodiments, the potassium salt is potassium ((2R,3 S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-3-((butoxyoxidophosphor-yl)oxy)tetrahydrofuran-2-yl)methyl butyl phosphate. In some embodiments, the magnesium salt is magnesium ((2R,3 S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-3-((butoxyoxidophosphor-yl)oxy)tetrahydrofuran-2-yl)methyl butyl phosphate. In some embodiments, the cobalt salt is cobalt ((2R,3 S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-3-((butoxyoxidophosphor-yl)oxy)tetrahydrofuran-2-yl)methyl butyl phosphate.

Pharmaceutically acceptable salts of the present disclosure can be prepared by standard techniques known in the art to which the present disclosure pertains. For example, the free-base form of a compound of the present disclosure can be dissolved in a suitable solvent, such as an aqueous or aqueous-alcohol solution containing the appropriate acid and then isolated by evaporating the solution. In another example, a salt can be prepared by reacting the free base and acid in an organic solvent. If the particular compound is an acid, the desired pharmaceutically acceptable salt may be prepared by any suitable method, including, for example, treatment of the free acid with an appropriate inorganic or organic base.

In some embodiments, the compound of Formula (I), or a pharmaceutically acceptable salt thereof, has certain surprising features and advantages that could not have been predicted prior to the present disclosure. One advantage of the compound of Formula (I), or a pharmaceutically acceptable salt thereof, in accordance with some embodiments of the present disclosure is that such compound and/or salt has a high level of biological activity when such compound and/or salt is formulated at higher (less acidic) pH levels. Without being bound by any theory, it is believed that the free amino group of the compound of Formula (I), or a pharmaceutically acceptable salt thereof, in accordance with some embodiments confers the desired biological activity at higher pH levels. It has been discovered that the compound of Formula (I), or a pharmaceutically acceptable salt thereof, in accordance with some embodiments of the present disclosure is unexpectedly more potent at pH levels above about pH 3. Accordingly, it is believed that the compound of Formula (I), or a pharmaceutically acceptable salt thereof, in accordance with some embodiments will be useful for indications in which prolonged exposure to antimicrobials is advantageous, such as, for example, microbial infections. Unlike some drugs formulated at below about pH 3 resulting in unacceptable contact irritation in topical, inhalation or intravesical administration routes, the compound of Formula (I), or a pharmaceutically acceptable salt thereof, in accordance with some embodiments is compatible with topical, inhalation and intravesical administration routes. Additionally, the compound of Formula (I), or a pharmaceutically acceptable salt thereof, in accordance with some embodiments is effective against slow growth bacteria since the compound or salt thereof exhibits, in a short period of time, a high level of biological activity at a higher pH (fast acting antimicrobial mechanism).

In addition to the compound of Formula (I), the present disclosure also includes prodrugs (e.g., pharmaceutically acceptable prodrugs), active metabolic derivatives (active metabolites), and their pharmaceutically acceptable salts.

Prodrugs are compounds or pharmaceutically acceptable salts thereof which, when metabolized under physiological conditions or when converted by solvolysis, yield the desired active compound. Typically, the prodrug is inactive, or less active than the active compound, but may provide one or more advantageous handling, administration, and/or metabolic properties. Some prodrugs are activated enzymatically to yield the active compound or a compound may undergo further chemical reaction to yield the active compound. Prodrugs may proceed from prodrug form to active form in a single step or may have one or more intermediate forms which such forms have activity or may be inactive.

As described in The Practice of Medicinal Chemistry, Ch. 31-32 (Ed. Wermuth, Academic Press, San Diego, Calif., 2001), prodrugs can be conceptually divided into two non-exclusive categories, including bioprecursor prodrugs and carrier prodrugs. Generally, bioprecursor prodrugs are compounds that are inactive or have low activity compared to the corresponding active drug compound that contain one or more protective groups and are converted to an active form by metabolism or solvolysis. Both the active drug form and any released metabolic products should have acceptably low toxicity. Typically, the formation of active drug compound involves a metabolic process or reaction that is one of the following types:

Oxidative reactions: Oxidative reactions are exemplified without limitation by reactions such as oxidation of alcohol, carbonyl, and acid functionalities, hydroxylation of aliphatic carbons, hydroxylation of alicyclic carbon atoms, oxidation of aromatic carbon atoms, oxidation of carbon-carbon double bonds, oxidation of nitrogen-containing functional groups, oxidation of silicon, phosphorus, arsenic, and sulfur, oxidative N-dealkylation, oxidative O- and S-dealkylation, oxidative deamination, as well as other oxidative reactions.

Reductive reactions: Reductive reactions are exemplified without limitation by reactions such as reduction of carbonyl functionalities, reduction of alcohol functionalities and carbon-carbon double bonds, reduction of nitrogen-containing functional groups, and other reduction reactions.

Reactions without change in the oxidation state: Reactions without change in the state of oxidation are exemplified without limitation by reactions such as hydrolysis of esters and ethers, hydrolytic cleavage of carbon-nitrogen single bonds, hydrolytic cleavage of non-aromatic heterocycles, hydration and dehydration at multiple bonds, new atomic linkages resulting from dehydration reactions, hydrolytic dehalogenation, removal of hydrogen halide molecule, and other such reactions.

Carrier prodrugs are drug compounds that contain a transport moiety, e.g., that improves uptake and/or localized delivery to a site(s) of action. Desirably for such a carrier prodrug, the linkage between the drug moiety and the transport moiety is a covalent bond, the prodrug is inactive or less active than the drug compound, and the prodrug and any release transport moiety are acceptably non-toxic. For prodrugs where the transport moiety is intended to enhance uptake, typically the release of the transport moiety should be rapid. In other cases, it is desirable to utilize a moiety that provides slow release, e.g., certain polymers or other moieties, such as cyclodextrins. Such carrier prodrugs are often advantageous for orally administered drugs. In some instances, the transport moiety provides targeted delivery of the drug. For example, the drug may be conjugated to an antibody or antibody fragment. Carrier prodrugs can, for example, be used to improve one or more of the following properties: increased lipophilicity, increased duration of pharmacological effects, increased site-specificity, decreased toxicity and adverse reactions, and/or improvement in drug formulation (e.g., stability, water solubility, suppression of an undesirable organoleptic or physiochemical property). For example, lipophilicity can be increased by esterification of hydroxyl groups with lipophilic carboxylic acids, or of carboxylic acid groups with alcohols, e.g., aliphatic alcohols. Wermuth, supra.

Metabolites, e.g., active metabolites, overlap with prodrugs as described above, e.g., bioprecursor prodrugs. Thus, such metabolites are pharmacologically active compounds or compounds that further metabolize to pharmacologically active compounds that are derivatives resulting from metabolic processes in the body of a subject. Of these, active metabolites are such pharmacologically active derivative compounds. For prodrugs, the prodrug compound is generally inactive or of lower activity than the metabolic product. For active metabolites, the parent compound may be either an active compound or may be an inactive prodrug. For example, in some compounds, one or more alkoxy groups can be metabolized to hydroxyl groups while retaining pharmacologic activity and/or carboxyl groups can be esterified, e.g., glucuronidation. In some cases, there can be more than one metabolite, where an intermediate metabolite(s) is further metabolized to provide an active metabolite. For example, in some cases a derivative compound resulting from metabolic glucuronidation may be inactive or of low activity and can be further metabolized to provide an active metabolite.

Metabolites of a compound of the present disclosure may be identified using routine techniques known in the art, and their activities determined using tests such as those described in Bertolini et al., 1997, J. Med. Chem., 40:2011-2016; Shan et al., 1997, J Pharm Sci 86(7):756-757; Bagshawe, 1995, Drug Dev. Res., 34:220-230; Wermuth, supra.

It is understood by those skilled in the art that some compounds may exhibit tautomerism. In such cases, the formulae provided herein expressly depict only one of the possible tautomeric forms. It is therefore to be understood that the compound of Formula (I) intends to represent any tautomeric form of the depicted compound and is not to be limited merely to the specific tautomeric form depicted by the drawing of the compound.

In the case of agents that are solids, it is understood by those skilled in the art that the compounds and salts may exist in different crystal or polymorphic forms, or may be formulated as co-crystals, or may be in an amorphous form, or may be any combination thereof (e.g. partially crystalline, partially amorphous, or mixtures of polymorphs) all of which are intended to be within the scope of the present disclosure and specified formulae. Whereas salts are formed by acid/base addition (i.e., a free base or free acid of the compound of interest forms an acid/base reaction with a corresponding addition base or addition acid, respectively, resulting in an ionic charge interaction), co-crystals are a new chemical species that is formed between neutral compounds, resulting in the compound and an additional molecular species in the same crystal structure.

In some instances, the compound of Formula (I) is complexed with an acid or a base, including without limitation base addition salts such as, for example, ammonium, diethylamine, ethanolamine, ethylenediamine, diethanolamine, t-butylamine, piperazine, meglumine; acid addition salts, such as, for example, acetate, acetylsalicylate, besylate, camsylate, citrate, formate, fumarate, glutarate, hydrochlorate, maleate, mesylate, nitrate, oxalate, phosphate, succinate, sulfate, tartrate, thiocyanate, and tosylate; and amino acids such as, for example, alanine, arginine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine or valine.

Additionally, the compound of Formula (I) is intended to cover hydrated or solvated as well as unhydrated or unsolvated forms. Other examples of solvates include without limitation the compound of Formula (I) in combination with a suitable solvent, such as isopropanol, ethanol, methanol, DMSO, ethyl acetate, acetic acid or ethanolamine, and the like.

In some embodiments, a compound of the present disclosure is a protonated compound. As used herein, the term “protonated compound” refers to a compound of the present disclosure that is protonated by adding protons (or positively charged hydrogen ions) to proton acceptor sites of a compound of the present disclosure. In some embodiments, the proton acceptor sites include the phosphate groups of a compound of the present disclosure as well as any additional proton acceptor sites on either the ribose or the butyl groups of a compound of the present disclosure.

As the number of proton acceptor sites that are protonated on a compound of the present disclosure increases, the pH obtained when a compound of the present disclosure is dissolved in water having a pH of 7 decreases and thus the amount of protonation of a compound of the present disclosure can be determined by measuring the pH of solutions of water after addition of a compound of the present disclosure. pH indicates the hydrogen ion concentration of a solution.

Solutions with a high concentration of hydrogen ions have a low pH and are therefore acidic, whereas solutions with a low concentration of hydrogen ions have a high pH and are therefore basic. In some embodiments, the compounds of the present disclosure are protonated so that when dissolved in water (pH 7) such compounds form an aqueous solution having a pH of from less than about pH 7 to about pH 1. As used herein, the term “about,” when used with numerical values is to be read as including the amount(s) specified and variations of 20%, 10%, 5%, 1%, 0.5%, and 0.1% of the amount specified. In some embodiments, a compound of the present disclosure is a protonated compound having a pH when dissolved in water of from less than about pH 6 to about pH 1. In some embodiments, a compound of the present disclosure is a protonated compound having a pH when dissolved in water of from about pH 5 to about pH 1.

In some embodiments, a compound of the present disclosure is a protonated compound having a pH when dissolved in water of from about pH 4.5 to about pH 1. In some embodiments, a compound of the present disclosure is a protonated compound having a pH when dissolved in water of from about pH 4 to about pH 1. In some embodiments, a compound of the present disclosure is a protonated compound having a pH when dissolved in water of from about pH 3 to about pH 1. In some embodiments, a compound of the present disclosure is a protonated compound having a pH when dissolved in water of from about pH 2 to about pH 1. In some embodiments, a compound of the present disclosure is a protonated compound having a pH when dissolved in water of about pH 3 to about pH 5. In some embodiments, a compound of the present disclosure is a protonated compound having a pH when dissolved in water of about pH 3 to about pH 4.

In some embodiments, protonation can be accomplished by incubating a compound of the present disclosure in the presence of a strong acid. Although a compound of the present disclosure can be protonated by adding protons to the reactive sites on the compound, other modifications of a compound of the present disclosure are possible and are intended to be encompassed by the term protonated compound as used herein. In some embodiments, protonated forms of the compounds of the present disclosure can be generated by subjecting the purified, partially purified or crude compounds to a low pH (e.g., acidic) environment. In some embodiments, purified or crude compounds can be protonated with acid, including phosphoric acid, nitric acid, hydrochloric acid, and acetic acid.

Other procedures to prepare a protonated compound of the present disclosure known to the skilled artisan are equally contemplated to be within the scope of the present disclosure. In some embodiments, once the compounds of the present disclosure have been protonated, such compounds may be separated from any undesired components such as, for example, excess acid. The skilled artisan would know of many ways to separate the compounds from undesired components, including but not limited to using an H+-cation exchanger (e.g., H+-SCX). In some embodiments, the compounds of the present disclosure may be subjected to chromatography following protonation. In some embodiments, a compound of the present disclosure is run over a poly(styrene-divinyl benzene) based resin (e.g., Hamilton's PRP-1 or 3 and Polymer Lab's PLRP) following protonation.

In some embodiments, the protonated compounds of the present disclosure can be used directly. In some embodiments, the protonated compounds of the present disclosure can be processed further to remove any excess acid or salt, e.g., via precipitation, reverse phase chromatography, diafiltration or gel filtration. In some embodiments, the protonated compounds of the present disclosure can be concentrated by lyophilization, solvent evaporation, and the like. In some embodiments, when suspended in water or saline, the compounds of the present disclosure generally exhibit a pH of from about pH 3 to about pH 5 depending upon the level of protonation/acidification, which is determined by how much acid is used in the acidification process. In some embodiments, compounds of the present disclosure can be protonated by passage over a cation exchange column charged with hydrogen ions.

In some embodiments, utilization of two butyl groups in a compound of the present disclosure prevents or limits substantial nuclease degradation, including without limitation exonuclease degradation, of a compound of the present disclosure. In some embodiments, the butyl groups are positioned to protect the ribose of a compound of the present disclosure. Percent acid degradation may be determined using analytical HPLC to assess the loss of functional molecules or by other suitable methods. Acid degradation is generally measured as a function of time. In some embodiments, the compounds of the present disclosure are also nuclease resistant, which allows such compounds to maintain activity (e.g., pH stability) in an in vivo setting. Percent degradation of the compounds of the present disclosure in a setting containing a nuclease may be determined by methods known to those skilled in the art, such as, for example, mass spectroscopy. Nuclease degradation is generally measured as a function of time. In some embodiments, a reference compound is employed in determining the extent or rate of acid or nuclease degradation. In some embodiments, the compounds of the present disclosure are 10%, 20%, 30%, 40%, 50%, 70%, 90%, 100%, 150%, 200%, 300%, 500% or 750% more stable than a reference compound.

A compound of the present disclosure in accordance with some embodiments is useful as an antimicrobial having activity against any microbe. As used herein, the terms “microbe,” “microbial,” and like terms refers to bacteria, fungi, protozoa, viruses, yeast, and the like. As used herein, the term “antimicrobial” refers to a compound of the present disclosure having the ability to kill or inhibit the growth of a microbe, or to attenuate the severity of a microbial infection. A non-limiting list of the bacteria that a compound of the present disclosure is effective against include without limitation gram positive bacteria, gram negative bacteria, slow growing bacteria and acid fast bacteria, and any species included in the following genera: Aerococcus, Listeria, Streptomyces, Chlamydia, Lactobacillus, Eubacterium, Burkholderia, Stentrophomonas, Achromobacter, Arachnid, Mycobacterium, Peptostreptococcus, Staphylococcus, Corynebacterium, Erysipelothrix, Dermatophilus, Rhodococcus, Pseudomonas, Streptococcus, Bacillus, Peptococcus, Pneumococcus, Micrococcus, Neisseria, Klebsiella, Kurthia, Nocardia, Serratia, Rothia, Escherichia, Propionibacterium, Actinomyces, Helicobacter, Enterococcus, Shigella, Vibrio, Clostridium, Salmonella, Yersinia, and Haemophilus.

A non-limiting list of the fungi that a compound of the present disclosure is effective against include without limitation Trichophyton, Epidermophyton, Microsporum, Candida albicans and other Candida species, Pityrosporum orbiculare, Trichophyton mentagrophytes, Trichophyton rubrum, Epidermophyton floccosurn, and Trichophyton tonsurans. A non-limiting list of the viruses that a compound of the present disclosure is effective against include without limitation human immunodeficiency virus (HIV), herpes simplex virus (HSV), cytomegalovirus (CMV), Hepatitis B virus (HBV), Hepatitis C virus (HCV), and influenza virus.

In some embodiments, a compound of the present disclosure is useful in both therapeutic and non-therapeutic medical applications. In some embodiments including non-therapeutic medical applications, the antimicrobial effect of a compound of the present disclosure allows use of a compound of the present disclosure for sterilization (e.g., sterilization of a patient's skin or of a surface or an object, such as, for example, a surgical instrument), or sanitization (e.g., the cleansing of a surface, instrument, as to render the surface free of undesirable concentrations of disease causing microorganisms). In some embodiments, the compounds of the present disclosure are effective in combating microbial contamination of laboratory cultures, consumables (e.g., food or beverage preparations), medical devices, hospital apparatus, or industrial processes. Therapeutic applications of a compound of the present disclosure are described herein.

The present disclosure also provides pharmaceutical compositions. As used herein, the term “pharmaceutical composition” refers to a pharmaceutical preparation that contains a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, and is suitable for administration to a patient for therapeutic purposes. As used herein, the term “patient” refers to a living organism that is treated with a compound of the present disclosure, including without limitation any mammal such as, for example, humans, other primates (e.g., monkeys, chimpanzees, etc.), companion animals (e.g., dogs, cats, horses, etc.), farm animals (e.g., goats, sheep, pigs, cattle, etc.), laboratory animals (e.g., mice, rats, etc.), and wild and zoo animals (e.g., wolves, bears, deer, etc.).

In some embodiments, the pharmaceutical composition may include at least one pharmaceutically acceptable component to provide an improved formulation of a compound of the present disclosure, including without limitation one or more pharmaceutically acceptable carriers, excipients or diluents. The carrier, excipient or diluent may take a wide variety of forms depending on the form of preparation desired for administration.

As used herein, the term “carrier” includes without limitation calcium carbonate, calcium phosphate, various sugars, such as lactose, glucose, or sucrose, types of starch, cellulose derivatives, gelatin, lipids, liposomes, nanoparticles, physiologically acceptable liquids as solvents or for suspensions, including, for example, sterile solutions of water for injection (WFI), saline solution, dextrose solution, Hank's solution, Ringer's solution, vegetable oils, mineral oils, animal oils, polyethylene glycols, liquid paraffin, and the like.

As used herein, the term “excipient” generally includes without limitation fillers, binders, disintegrants, glidants, lubricants, complexing agents, solubilizers, stabilizer, preservatives, and surfactants, which may be chosen to facilitate administration of the compound by a particular route. Suitable excipients may also include, for example, colloidal silicon dioxide, silica gel, talc, magnesium silicate, calcium silicate, sodium aluminosilicate, magnesium trisilicate, powdered cellulose, macrocrystalline cellulose, carboxymethyl cellulose, cross-linked sodium carboxymethylcellulose, sodium benzoate, calcium carbonate, magnesium carbonate, stearic acid, aluminum stearate, calcium stearate, magnesium stearate, zinc stearate, sodium stearyl fumarate, syloid, stearowet C, magnesium oxide, starch, sodium starch glycolate, glyceryl monostearate, glyceryl dibehenate, glyceryl palmitostearate, hydrogenated vegetable oil, hydrogenated cotton seed oil, castor seed oil, mineral oil, polyethylene glycol (e.g., PEG 4000-8000), polyoxyethylene glycol, poloxamers, povidone, crospovidone, croscarmellose sodium, alginic acid, casein, methacrylic acid divinylbenzene copolymer, sodium docusate, cyclodextrins (e.g., 2-hydroxypropyl-delta-cyclodextrin), polysorbates (e.g., polysorbate 80), cetrimide, TPGS (d-alpha-tocopheryl polyethylene glycol 1000 succinate), magnesium lauryl sulfate, sodium lauryl sulfate, polyethylene glycol ethers, di-fatty acid ester of polyethylene glycols, or a polyoxyalkylene sorbitan fatty acid ester (e.g., polyoxyethylene sorbitan ester Tween®), polyoxyethylene sorbitan fatty acid esters, sorbitan fatty acid ester, e.g., a sorbitan fatty acid ester from a fatty acid such as oleic, stearic or palmitic acid, mannitol, xylitol, sorbitol, maltose, lactose, lactose monohydrate or lactose spray dried, sucrose, fructose, calcium phosphate, dibasic calcium phosphate, tribasic calcium phosphate, calcium sulfate, dextrates, dextran, dextrin, dextrose, cellulose acetate, maltodextrin, simethicone, polydextrosem, chitosan, gelatin, HPMC (hydroxypropyl methyl celluloses), HPC (hydroxypropyl cellulose), hydroxyethyl cellulose, and the like.

As the skilled artisan understands, any diluent known in the art may be utilized in accordance with the present disclosure. In some embodiments of the present disclosure, the diluent is water soluble. In some embodiments of the present disclosure, the diluent is water insoluble. As used herein, the term “diluent” includes without limitation water, saline, phosphate buffered saline (PBS), dextrose, glycerol, ethanol, buffered sodium or ammonium acetate solution, or the like, and combinations thereof.

In some embodiments, the pharmaceutical compositions of the present disclosure include at least one additional active ingredient. As used herein, the term “active ingredient” refers to a therapeutically active compound, as well as any prodrugs thereof and pharmaceutically acceptable salts, hydrates, and solvates of the compound and the prodrugs. Additional active ingredients may be combined with a compound of the present disclosure and may be either administered separately or in the same pharmaceutical composition. The amount of additional active ingredients to be given may be determined by one skilled in the art based upon therapy with a compound of the present disclosure.

In some embodiments, the pharmaceutical composition is a human pharmaceutical composition. As used herein, the term “human pharmaceutical composition” refers to a pharmaceutical composition intended for administration to a human.

The pharmaceutical compositions of the present disclosure are suitable for administration to a patient by any suitable means, including without limitation those means used to administer conventional antimicrobials. The pharmaceutical compositions of the present disclosure may be administered using any applicable route that would be considered by one of ordinary skill, including without limitation oral, intravenous (“IV”) injection or infusion, intravesical, subcutaneous (“SC”), intramuscular (“TM”), intraperitoneal, intradermal, intraocular, inhalation (and intrapulmonary), intranasal, transdermal, epicutaneously, subdermal, topical, mucosal, nasal, ophthalmic, impression into skin, intravaginal, intrauterine, intracervical, and rectal. Such dosage forms should allow a compound of the present disclosure to reach target cells. Other factors are well known in the art and include considerations such as toxicity and dosage forms that retard a compound or composition from exerting its effects. Techniques and formulations generally may be found in Remington: The Science and Practice of Pharmacy, 21st edition,

Lippincott, Williams and Wilkins, Philadelphia, Pa., 2005.

In some embodiments, the pharmaceutical compositions of the present disclosure are adapted for topical administration. As used herein, the term “topical administration” refers to administration of a compound of the present disclosure to the skin surface of a patient so that a compound of the present disclosure passes through the skin layer. Transdermal administration and transmucosal administration are also encompassed within the term topical administration. As used herein, the term “transdermal” refers to passage of a compound of the present disclosure across at least one skin layer of a patient. As used herein, “transmucosal” refers to passage of a compound of the present disclosure across a mucous membrane of a patient. Unless otherwise stated or implied, the terms “topical administration,” “transdermal administration,” and “transmucal administration” are used interchangeably herein.

A variety of topical delivery systems for delivering bioactive compounds to microbes in an patient are well known in the art. Such systems include without limitation lotions, creams, gels, oils, ointments, solutions, suspensions, emulsions, and the like by choice of appropriate carriers in the art. In some embodiments, the pharmaceutical composition is administered in the form of a gel including a polyhydric alcohol.

Suitable carriers include without limitation vegetable or mineral oils, white petrolatum (e.g., white soft paraffin), branched chain fats or oils, animal fats and high molecular weight alcohol (e.g., greater than C12). In some embodiments, carriers are selected such that a compound of the present disclosure is soluble. In some embodiments, emulsifiers, stabilizers, humectants, and antioxidants may also be included as well as agents imparting color or fragrance, if desired. In some embodiments, an organic solvent or co-solvent such as ethanol or propanol may be employed in the pharmaceutical compositions of the present disclosure. In some embodiments, evaporation of the solvent leaves a residue on the treated surface to inhibit reinfection. In some embodiments, penetrants appropriate to the barrier to be permeated are used. Such penetrants are generally known in the art and include without limitation bile salts and fusidic acid derivatives. In some embodiments, detergents may be used to facilitate permeation. In some embodiments, creams for topical administration are formulated from a mixture of mineral oil, self-emulsifying beeswax, and water in which mixture a compound of the present disclosure, dissolved in a small amount of solvent (e.g., an oil), is admixed. The specific topical delivery system used depends on the location of the microbes.

In some embodiments, other materials may also be added to the topical pharmaceutical compositions of the present disclosure have additional moisturizing effects and to improve the consistency of the pharmaceutical composition. Examples of such compounds include without limitation cetyl esters wax, stearyl alcohol, cetyl alcohol, glycerin, methyl paraben, propyl paraben, quaternium-15, humectants, volatile methylsiloxane fluids, and polydiorganosiloxane-polyoxyalkylene. See, e.g., U.S. Pat. Nos. 5,153,230 and 4,421,769. If it is desirable for the pharmaceutical composition to have additional cleaning effects in some embodiments, chemicals such as sodium lauryl sulfate or a metal salt of a carboxylic acid may be added.

In some embodiments, a wide variety of nonvolatile emollients are useful in the pharmaceutical compositions of the present disclosure. Non-limiting examples of such nonvolatile emollients are listed in McCutcheon's, Vol. 2 Functional Materials, North American Edition, (1992), pp. 137-168, and CTFA Cosmetic Ingredient Handbook, Second Edition (1992) which lists Skin-Conditioning Agents at pp. 572-575 and Skin Protectants at p. 580. In some embodiments, the nonvolatile emollients include silicones, hydrocarbons, esters, and mixtures thereof. In some embodiments, the esters include esters of monofunctional and difunctional fatty acids that have been esterified with alcohols and polyols (i.e., alcohols having two or more hydroxyl groups). In some embodiments, long chain esters of long chain fatty acids are utilized in the pharmaceutical compositions of the present disclosure (i.e., C10-40 fatty acids esterified with C10-40 fatty alcohols). Non-limiting examples of esters useful in the pharmaceutical compositions of the present disclosure include without limitation those selected from the group consisting of diisopropyl adipate, isopropyl myristate, isopropyl palmitate, myristyl propionate, ethylene glycol distearate, 2-ethylhexyl palmitate, isodecyl neopentanoate, C12-15 alcohol benzoate, di-2-ethylhexyl maleate, ceryl palmitate, myristyl myristate, stearyl stearate, cetyl stearate, behenyl behenrate, and mixtures thereof.

Examples of silicone emollients useful in the pharmaceutical compositions of the present disclosure include without limitation polyalkylsiloxanes, cyclic polyalkylsiloxanes, and polyalkylarylsiloxanes. Suitable commercially available polyalkylsiloxanes include the polydimethylsiloxanes, which are also known as dimethicones, non-limiting examples of which include the Vicasil™ series sold by General Electric Company and the Dow Corning™ 200 series sold by Dow Corning Corporation. Commercially available polyalkylsiloxanes include cyclomethicones (Dow Corning™ 244 fluid), Dow Corning™ 344 fluid, Dow Corning™ 245 fluid and Dow Corning™ 345), among others. A suitable commercially available trimethylsiloxysilicate is sold as a mixture with dimethicone as Dow Corning™ 593 fluid. Also useful in the pharmaceutical compositions of the present disclosure are dimethiconols, which are hydroxyl terminated dimethyl silicones. Suitable commercially available dimethiconols are typically sold as mixtures with dimethicone or cyclomethicone (e.g., Dow Corning™ 1401, 1402, and 1403 fluids). Suitable commercially available polyalkylarylsiloxanes include SF1075 methylphenyl fluid (sold by General Electric Company) and 556 Cosmetic Grade phenyl trimethicone fluid (sold by Dow Coring Corporation).

Hydrocarbons suitable for use in the pharmaceutical compositions of the present disclosure include without limitation straight and branched chain hydrocarbons having from about 10 to about 30 carbon atoms. In some embodiments, the straight and branched chain hydrocarbons have from about 12 to about 24 carbon atoms. In some embodiments, the straight and branched chain hydrocarbons have from about 16 to about 22 carbon atoms. Non-limiting examples of such hydrocarbon materials include dodecane, squalane, cholesterol, 5 hydrogenated polyisobutylene, docosane (i.e., a C22 hydrocarbon), hexadecane, and isohexadecane (a commercially available hydrocarbon sold as Permethyl™ 101A by Presperse, South Plainsfield, N.J.), among others.

In some embodiments, the topical pharmaceutical compositions of the present disclosure include propylene glycol. In some embodiments, propylene glycol acts as a surfactant and assists in penetration, contact, and absorption of a compound of the present disclosure. In some embodiments, propylene glycol serves as a preservative. In some embodiments, the pharmaceutical compositions of the present disclosure include a non-ionic surfactant, such as, for example, polysorbate. Such a surfactant provides better surface contact of the pharmaceutical compositions of the present disclosure with mucosa (such as vaginal mucosa) by further reducing surface tension.

The topical pharmaceutical compositions of the present disclosure optionally may also be formulated with a lipophilic phase, such as, for example, emulsions and liposome dispersions. In some embodiments, liposomal formulations may extend circulation time of a compound of the present disclosure, increase permeability of a compound of the present disclosure, and improve overall efficacy of a compound of the present disclosure as an antimicrobial. In some embodiments, a compound of the present disclosure may be combined with a lipid, cationic lipid or anionic lipid. In some embodiments, the resulting emulsion or liposomal suspension in conjunction with the pH stabilizing qualities of a compound of the present disclosure can effectively increase the in vivo half-life of the activity of a pharmaceutical composition of the present disclosure. Examples of suitable anionic lipids for use with the pharmaceutical compositions of the present disclosure include, but are not limited to, cardiolipin, dimyristoyl, dipalmitoyl, dioleoyl phosphatidyl choline, phosphatidyl glycerol, palmitoyloleoyl phosphatidyl choline, phosphatidyl glycerol, phosphatidic acid, lysophosphatidic acid, phosphatidyl serine, phosphatidyl inositol, and anionic forms of cholesterol.

In some embodiments, a compound of the present disclosure is incorporated into liposomes. In some embodiments, neutral lipids, cholesterol, and/or polyethylene glycol (PEG) are utilized in such liposomes. In some embodiments, the liposomal composition is composed of partially hydrogenated soy phosphatidylcholine (PHSC), cholesterol, methoxy-terminated PEG (mPEG), and/or distearoyl phosphatidyl ethanolamine (DSPE). The liposomes can be prepared according to any suitable method known in the art.

In some embodiments, topical administration is through nasal sprays or suppositories (rectal or vaginal). Suppositories are prepared by mixing a compound of the present disclosure with a lipid vehicle such as Theobroma oil, cacao butter, glycerin, gelatin, polyoxyethylene glycols, and the like. In some embodiments, topical administration comprises a transdermal patch or dressing such as a bandage impregnated with a compound of the present disclosure and optionally one or more carriers, excipients or diluents known in the art. In some embodiments, such dressings include without limitation semipermeable films, foams, hydrocolloids, and calcium alginate swabs. In some embodiments, the dosage administration will be continuous rather than intermittent throughout the dosage regimen.

In some embodiments, the pharmaceutical compositions of the present disclosure are adapted for oral administration. As used herein, the term “oral administration” refers to administration of a compound of the present disclosure to the mouth of a patient for ingestion into the gastrointestinal tract. In some embodiments, the pharmaceutical compositions of the present disclosure can be formulated into conventional oral dosage forms including without limitation capsules, tablets, powders, and liquid preparations such as suspensions, solutions, elixirs, syrups, concentrated drops, and the like. In some embodiments, a compound of the present disclosure may be combined with solid excipients, optionally grinding a resulting mixture, and optionally processing the mixture of granules, after adding suitable auxiliaries, if desired, to obtain, for example, tablets, coated tablets, hard capsules, soft capsules, solutions (e.g., aqueous, alcoholic or oily solutions), and the like. In some embodiments, excipients suitable for use in the oral pharmaceutical compositions of the present disclosure include without limitation fillers such as sugars, including lactose, glucose, sucrose, mannitol, or sorbitol; cellulose preparations, for example, corn starch, wheat starch, rice starch, potato starch, gelatin, gum tragacanth, methyl cellulose, hydroxypropylmethyl-cellulose, sodium carboxymethylcellulose (CMC), and/or polyvinylpyrrolidone (PVP or povidone); and oily excipients, including vegetable and animal oils, such as sunflower oil, olive oil, or cod liver oil. In some embodiments, the oral pharmaceutical compositions of the present disclosure may also contain disintegrating agents, such as, for example, cross-linked polyvinylpyrrolidone, agar, or alginic acid, or a salt thereof such as sodium alginate; a lubricant, such as talc or magnesium stearate; a plasticizer, such as glycerol or sorbitol; a sweetening agent such as sucrose, fructose, lactose, or aspartame; a natural or artificial flavoring agent, such as, for example, peppermint, oil of wintergreen, or cherry flavoring; or dye-stuffs or pigments, which may be used for identification or characterization of different doses or combinations. In some embodiments, the oral pharmaceutical compositions of the present disclosure may also contain dragée cores with suitable coatings. In some embodiments, concentrated sugar solutions may be used, which may optionally contain, for example, gum arabic, talc, poly-vinylpyrrolidone, carbopol gel, polyethylene glycol, titanium dioxide, lacquer solutions, and suitable organic solvents or solvent mixtures.

In some embodiments, the pharmaceutical compositions of the present disclosure that can be used orally include without limitation push-fit capsules made of gelatin (“gelcaps”), as well as soft, sealed capsules made of gelatin, and a plasticizer, such as glycerol or sorbitol. In some embodiments, the push-fit capsules can contain a compound of the present disclosure in admixture with filler such as lactose, binders such as starches, and/or lubricants such as talc or magnesium stearate and, optionally, stabilizers. In some embodiments including soft capsules, the active compound may be dissolved or suspended in suitable liquids, such as fatty oils, liquid paraffin, liquid polyethylene glycols, and the like.

In some embodiments, the pharmaceutical compositions of the present disclosure are adapted for inhalation administration. As used herein, the term “inhalation administration” refers to delivery of a compound of the present disclosure by passage through a patient's nose or mouth during inhalation and passage of the compound through the walls of the lungs of the patient. In some embodiments, the pharmaceutical compositions of the present disclosure suitable for inhalation administration may be formulated as dry powder or a suitable solution, suspension or aerosol. In some embodiments, powders and solutions may be formulated with suitable additives known in the art. In some embodiments, powders may include a suitable powder base such as lactose or starch. In some embodiments, solutions may comprise propylene glycol, sterile water, ethanol, sodium chloride, and other additives, such as, for example, acid, alkali, and buffer salts. In some embodiments, such solutions or suspensions may be administered by inhaling via a spray, pump, atomizer, nebulizer, and the like. In some embodiments, the pharmaceutical compositions of the present disclosure suitable for inhalation administration may also be used in combination with other inhaled therapies, including without limitation corticosteroids such as, for example, fluticasone proprionate, beclomethasone dipropionate, triamcinolone acetonide, budesonide, and mometasone furoate; beta agonists such as, for example, albuterol, salmeterol, and formoterol; anticholinergic agents such as, for example, ipratroprium bromide or tiotropium;

vasodilators such as, for example, treprostinal and iloprost; enzymes such as, for example, DNAase; therapeutic proteins; immunoglobulin antibodies; an oligonucleotide, such as, for example, single or double stranded DNA or RNA, siRNA; antibiotics such as, for example, tobramycin; muscarinic receptor antagonists; leukotriene antagonists; cytokine antagonists; protease inhibitors; cromolyn sodium; nedocril sodium; and sodium cromoglycate.

In some embodiments, the pharmaceutical compositions of the present disclosure are adapted for intravesical administration. As used herein, the term “intravesical administration” refers to delivery of a compound of the present disclosure directly into the bladder of a patient. In some embodiments, the pharmaceutical composition is administered via a catheter. In some embodiments, the catheter is a urethral catheter.

In some embodiments, the pharmaceutical compositions of the present disclosure are adapted for parenteral administration. As used herein, the term “parenteral administration” refers to a compound of the present disclosure being injected or infused into a patient and includes without limitation intravenous, intramuscular, intraarterial, intrathecal, intraventricular, intracapsular, intraorbital, intracardiac, intradermal, intraperitoneal, transtracheal, subcutaneous, subcuticular, intraarticular, sub capsular, subarachnoid, intraspinal, intracerebro spinal, and intrasternal injection and infusion. In some embodiments, the pharmaceutical compositions of the present disclosure suitable for parenteral administration may be formulated in sterile liquid solutions, including without limitation physiologically compatible buffers or solutions, such as, for example, saline solution, Hank's solution or Ringer's solution. In some embodiments, the pharmaceutical compositions of the present disclosure suitable for parenteral administration may be prepared as dispersions in non-aqueous solutions, such as, for example, glycerol, propylene glycol, ethanol, liquid polyethylene glycols, triacetin, vegetable oils, and the like. In some embodiments, solutions may also contain a preservative, such as, for example, methylparaben, propylparaben, chlorobutanol, phenol, sorbic acid, thimerosal, and the like. In addition, pharmaceutical compositions of the present disclosure suitable for parenteral administration may be formulated in solid form, including, for example, lyophilized forms, and redissolved or suspended prior to use. In some embodiments, the pharmaceutical composition is administered via a needle.

In some embodiments, the present disclosure provides methods and compositions of pretreating a catheter with a compound of the present disclosure, for example, to prevent an infection after the catheter is inserted into a patient. In some embodiments, a method of the present disclosure includes coating a catheter with a compound of the present disclosure prior to inserting the catheter into a patient. In some embodiments, the present disclosure provides a composition comprising a catheter coated with a compound of the present disclosure. In some embodiments, such methods and compositions may be used as a prophylactic treatment of an infection in a patient.

The present disclosure also provides methods of treatment. As used herein, the terms “treating,” “treatment,” “therapy,” and like terms refer to administration of a compound or pharmaceutical composition of the present disclosure in an amount effective to prevent, alleviate or ameliorate one or more symptoms of a disease or condition (i.e., indication) and/or to prolong the survival of the patient being treated. In some embodiments, “treating,” “treatment,” “therapy,” and like terms also include without limitation reducing or eliminating infection in a patient.

In carrying out the methods of the present disclosure, an effective amount of a compound of the present disclosure is administered to a patient in need thereof. As used herein, the term “effective amount,” in the context of administration, refers to the amount of a compound or pharmaceutical composition of the present disclosure that when administered to a patient is sufficient to prevent, alleviate or ameliorate one or more symptoms of a disease or condition (i.e., indication) and/or to prolong the survival of the patient being treated. Such an amount should result in no or few adverse events in the treated patient. Similarly, such an amount should result in no or few toxic effects in the treated patient. As those familiar with the art will understand, the amount of a compound or pharmaceutical composition of the present disclosure will vary depending upon a number of factors, including without limitation the activity of a compound of the present disclosure (in vitro, e.g. a compound of the present disclosure vs. target, or in vivo activity in animal efficacy models), pharmacokinetic results in animal models (e.g., biological half-life or bioavailability), the type of patient being treated, the patient's age, size, weight, and general physical condition, the disorder associated with the patient, and the dosing regimen being employed in the treatment.

In some embodiments of the present disclosure, an effective amount of a compound of the present disclosure to be delivered to a patient in need thereof can be quantified by determining micrograms of a compound of the present disclosure per kilogram of patient body weight. In some embodiments, the amount of a compound of the present disclosure administered to a patient is from about 0.1 to about 1000 milligram (mg) of a compound of the present disclosure per kilogram (kg) of patient body weight. In some embodiments, the amount of a compound of the present disclosure administered to a patient is from about 0.1 to about 500 mg of a compound of the present disclosure per kg of patient body weight. In some embodiments, the amount of a compound of the present disclosure administered to a patient is from about 0.1 to about 300 mg of a compound of the present disclosure per kg of patient body weight. In some embodiments, the amount of a compound of the present disclosure administered to a patient is from about 0.1 to about 200 mg of a compound of the present disclosure per kg of patient body weight. In some embodiments, the amount of a compound of the present disclosure administered to a patient is from about 0.1 to about 100 mg of a compound of the present disclosure per kg of patient body weight. As those of ordinary skill in the art understand multiple doses may be used.

In some embodiments of the present disclosure, a compound of the present disclosure is administered as a multiple dose regimen. As used herein, the term “multiple dose regimen” refers to a treatment time period of more than one day. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 2 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 3 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 4 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 5 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 6 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 7 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 14 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about one month. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about two months. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about three months. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about four months. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about five months. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about six months. Other time periods may be used herein.

In some embodiments of the present disclosure, a compound of the present disclosure is administered as part of a chronic treatment regimen. As used herein, the term “chronic treatment regimen” refers to treatment with a compound of the present disclosure over an extended period of time during a patient's lifetime. In some embodiments, chronic treatment is lifelong treatment.

In some embodiments of the present disclosure, a compound of the present disclosure is administered as a single dose. In some embodiments of the present disclosure, a compound of the present disclosure is administered as a single unit dose. As used herein, the term “unit dose” is a predetermined amount of a compound of the present disclosure. The amount of a compound of the present disclosure is generally equal to the dosage of a compound of the present disclosure that would be administered to a patient or a convenient fraction of such a dosage such as, for example, one-half or one-third of such a dosage. According to the methods of the present disclosure, the terms “single dose” and “single unit dose” include embodiments wherein a compound of the present disclosure can be administered as a single application and administered as multiple applications.

In some embodiment, a compound of the present disclosure may also be used in combination with one or more additional active ingredients for treating the same disease or condition. In some embodiments, such combination use includes administration of a compound of the present disclosure and one or more additional active ingredient at different times, or co-administration of a compound of the present disclosure and one or more additional active ingredients. In some embodiments, dosage may be modified for a compound of the present disclosure or one or more additional active ingredients used in combination, e.g., reduction in the amount dosed relative to a compound of the present disclosure or one or more additional active ingredients used alone, by methods well known to those of ordinary skill in the art. In some embodiments, co-administration includes simultaneous administration of a compound of the present disclosure and an additional active ingredient in the same dosage form, simultaneous administration of a compound of the present disclosure and an additional active ingredient in separate dosage forms, and separate administration of a compound of the present disclosure and an additional active ingredient.

It is understood that use in combination includes use with one or more additional active ingredients or other medical procedure in which the one or more additional active ingredients or other medical procedure may be administered at different times (e.g., within a short time, such as within hours (e.g., 1, 2, 3, 4-24 hours, etc.), or within a longer time (e.g. 1-2 days, 2-4 days, 4-7 days, 1-4 weeks, etc.)) than a compound or pharmaceutical composition of the present disclosure, or at the same time as a compound or pharmaceutical composition of the present disclosure. Use in combination also includes use with one or more additional active ingredients or other medical procedure that is administered once or infrequently, such as surgery, along with a compound or pharmaceutical composition of the present disclosure administered within a short time or longer time before or after the administration of the one or more additional active ingredients or completion of the other medical procedure.

In some embodiments, the present disclosure provides for delivery of a compound or pharmaceutical composition of the present disclosure and one or more additional active ingredients delivered by a different route of administration or by the same route of administration. In some embodiments, the use in combination for any route of administration includes delivery of a compound or pharmaceutical composition of the present disclosure and one or more additional active ingredients delivered by the same route of administration together in any pharmaceutical composition, including pharmaceutical compositions in which the two compounds are chemically linked in such a way that such compounds maintain their therapeutic activity when administered. In some embodiments, the one or more additional active ingredients may be co-administered with a compound or pharmaceutical composition of the present disclosure. In some embodiments, use in combination by co-administration includes administration of co-formulations or formulations of chemically joined compounds, or administration of two or more compounds in separate formulations within a short time of each other (e.g., within an hour, 2 hours, 3 hours, up to 24 hours, etc.), administered by the same or different routes. In some embodiments, co-administration of separate formulations includes co-administration by delivery via one device, for example, the same inhalant device, the same syringe, etc., or administration from separate devices within a short time of each other. In some embodiments, co-formulations of a compound or pharmaceutical composition of the present disclosure and one or more additional active ingredients delivered by the same route includes preparation of the materials together such that they can be administered by one device, including the separate compounds combined in one formulation, or compounds that are modified such that the compounds are chemically joined, yet still maintain their biological activity. In some embodiments, such chemically joined compounds may have a linkage that is substantially maintained in vivo, or the linkage may break down in vivo, separating the two active components.

The present disclosure also provides a method of treating an infection in a patient in need thereof. In some embodiments, the method comprises administering an effective amount of a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, to the patient. As used herein, the term “infection” refers to any microbe infection of a patient's body. Infection includes the invasion of a patient's body by a microbe and subsequent multiplication in the patient's body.

The present disclosure also provides a method of treating an infection of at least one of a wound or an ulcer in a patient in need thereof. In some embodiments, the method comprises administering an effective amount of a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, to the patient. As used herein, the term “wound” refers to an injury to the body of a patient that may involve laceration or breaking of a membrane (e.g., skin) and/or damage to underlying tissues. As used herein, the term “ulcer” refers to a break in skin or mucous membrane with loss of surface tissue, disintegration, and necrosis of epithelial tissue. In some embodiments, an ulcer may involve pus.

The present disclosure also provides a method of treating an infection of a lower extremity ulcer in a patient in need thereof. In some embodiments, the method comprises administering an effective amount of a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, to the patient. As used herein, the term “lower extremity” refers to a lower limb of a patient's body, including without limitation the hip, thigh, leg, ankle, and foot.

In some embodiments, the present disclosure provides a method of treating an infection of a diabetic foot ulcer in a patient in need thereof. In some embodiments, the method comprises administering an effective amount of a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, to the patient. In some embodiments, the patient is suffering from Type I diabetes or Type II diabetes. As used herein, the term “diabetic foot ulcer” refers to an ulcer located anywhere on the foot of a patient. In some embodiments, the ulcer is located on the heel, mid-foot, and/or forefoot of the patient's foot. As used herein, the term “treating,” in the context of a diabetic foot ulcer, also includes without limitation reducing or eliminating infection in a patient, which, in some embodiments, results in limiting the progression in size, area, and/or depth of the foot ulcer; reducing the size, area, and/or depth of the foot ulcer; increasing the rate of healing and/or reducing time to healing; healing of the foot ulcer (about 100% epithelialization with no drainage); and/or decreased incidence of amputation or slowing in time to amputation.

In some embodiments, the patient is a human. In some embodiments, the administration is topical administration. In some embodiments, the administration is carried out using the compound, or a pharmaceutically acceptable salt thereof, in a lotion, paste, gel, cream, ointment, oil or other viscous composition. In some embodiments, the patient is administered at least one additional active ingredient. In some embodiments, the administration is carried out as a multiple dose regimen. In some embodiments, the multiple dose regimen is a time period of up to about one month. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about two months. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about three months. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about four months. Other time periods may be used herein.

In some embodiments, the administration is carried out one or more times per day. In some embodiments, the administration is carried out one time per day. In some embodiments, the administration is carried out two times per day. In some embodiments, the administration is carried out three times per day. In some embodiments, the administration is carried out four times per day.

The present disclosure also provides a method of treating a urinary tract infection in a patient in need thereof. In some embodiments, the method comprises administering an effective amount of a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, to the patient. As used herein, the term “urinary tract” refers to the organs of a patient's body that produce, store, and discharge urine and includes without limitation the kidneys, ureters, bladder, and urethra. As used herein, the term “urinary tract infection” refers to an infection of the urinary tract of a patient and includes without limitation an uncomplicated urinary tract infection and a complicated urinary tract infection. As used herein, the term “uncomplicated urinary tract infection” refers to an infection by a microbe of a structurally and functionally normal urinary tract of a patient. As used herein, the term “complicated urinary tract infection” refers to an infection by a microbe of an abnormal structural and functional urinary tract of a patient. In some embodiments, the complicated urinary tract infection is a catheter-associated urinary tract infection. As used herein, the term “catheter-associated urinary tract infection” refers to a complicated urinary tract infection that occurs in a patient having an indwelling urinary catheter.

In some embodiments, the patient is a human. In some embodiments, the administration is intravesical administration. In some embodiments, the administration is carried out using a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, in a liquid solution or suspension. In some embodiments, the patient is administered at least one additional active ingredient. In some embodiments, the administration is carried out as a multiple dose regimen. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 2 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 3 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 4 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 5 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 6 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 7 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 14 days. In some embodiments of the present disclosure, the administration is carried out as a chronic treatment regimen. Other time periods may be used herein.

In some embodiments, the administration is carried out one or more times per day. In some embodiments, the administration is carried out one time per day. In some embodiments, the administration is carried out two times per day. In some embodiments, the administration is carried out three times per day. In some embodiments, the administration is carried out four times per day.

The present disclosure also provides a method of treating a lung infection in a patient in need thereof. In some embodiments, the method comprises administering an effective amount of a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, to the patient. As used herein, the term “lung infection” refers to an infection of one or both of a patient's lungs. In some embodiments, the lung infection arises from a pulmonary condition. As used herein, the term “pulmonary condition” refers to both infection and non-infection induced disease and dysfunction of the respiratory system.

Non-limiting examples of pulmonary conditions include without limitation genetic conditions, acquired conditions, primary conditions, secondary conditions, asthma, chronic obstructive pulmonary disease, cystic fibrosis, bronchiolitis, pneumonia, bronchitis, emphysema, adult respiratory distress syndrome, allergies, lung cancer, small cell lung cancer, primary lung cancer, metastatic lung cancer, brochiectasis, bronchopulmonary dysplasia, chronic bronchitis, chronic lower respiratory diseases, croup, high altitude pulmonary edema, pulmonary fibrosis, interstitial lung disease, reactive airway disease, lymphangioleiomyomatosis, neonatal respiratory distress syndrome, parainfluenza, pleural effusion, pleurisy, pneumothorax, primary pulmonary hypertension, psittacosis, pulmonary edema secondary to various causes, pulmonary embolism, pulmonary hypertension secondary to various causes, respiratory failure secondary to various causes, sleep apnea, sarcoidosis, smoking, stridor, acute respiratory distress syndrome, infectious diseases, SARS, tuberculosis, psittacosis infection, Q fever, parainfluenza, respiratory syncytial virus, combinations thereof, and conditions caused by any one or combination of the above.

In some embodiments of the present disclosure, a method of treating a lung infection arising from cystic fibrosis in a patient in need thereof is provided. In some embodiments, the method comprises administering an effective amount of a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, to the patient. As used herein, the term “cystic fibrosis” refers to a genetic disease that causes the production of abnormally thick mucus resulting in lung infections and damage to the lungs, digestive system, and other organs in a patient's body.

In some embodiments, the administration is inhalation administration. In some embodiments, the patient is administered at least one additional active ingredient. In some embodiments, the patient is a human. In some embodiments, the administration is carried out using a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, in a liquid solution, suspension or dry powder. In some embodiments, the administration is carried out as a multiple dose regimen. In some embodiments, the multiple dose regimen is a time period of up to about one month. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about two months. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about three months. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about four months. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about five months. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about six months. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about seven months. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about eight months. Other time periods may be used herein.

In some embodiments, the administration is carried out one or more times per day. In some embodiments, the administration is carried out one time per day. In some embodiments, the administration is carried out two times per day. In some embodiments, the administration is carried out three times per day. In some embodiments, the administration is carried out four times per day.

In some embodiments of the present disclosure, a method of treating pneumonia in a patient in need thereof is provided. In some embodiments, the method comprises administering an effective amount of a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, to the patient. As used herein, the term “pneumonia” refers to an infection by a microbe of one or both lungs of a patient resulting in inflammation of lung tissue. In some embodiments, the pneumonia is ventilator acquired pneumonia. As used herein, the term “ventilator acquired pneumonia” refers to pneumonia arising from a patient being connected to a mechanical ventilation machine. Ventilator acquired pneumonia includes pneumonia occurring more than about 48 hours after a patient has been intubated and received mechanical ventilation.

In some embodiments, the administration is inhalation administration. In some embodiments, the patient is administered at least one additional active ingredient. In some embodiments, the patient is a human. In some embodiments, the administration is carried out using a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, in a liquid solution, suspension or dry powder. In some embodiments, the administration is carried out as a multiple dose regimen. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 7 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 14 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 21 days. In some embodiments, the multiple dose regimen is a time period of up to about one month. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about two months. Other time periods may be used herein.

In some embodiments, the administration is carried out one or more times per day. In some embodiments, the administration is carried out one time per day. In some embodiments, the administration is carried out two times per day. In some embodiments, the administration is carried out three times per day. In some embodiments, the administration is carried out four times per day.

The present disclosure also provides a method of treating an infection in a burn wound in a patient in need thereof. In some embodiments, the method comprises administering an effective amount of a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, to the patient. As used herein, the term “burn wound” refers to a burn injury to a patient's body involving damage to a patient's skin and possibly tissues underlying the patient's skin. There are three primary types of burn levels known to one of skill in the art, including without limitation first, second, and third degree burns. In some embodiments, the method of treating an infection in a burn wound contemplated by the present disclosure is used to treat a first, second, and/or third degree burn.

In some embodiments, the patient is a human. In some embodiments, the administration is topical administration. In some embodiments, the administration is carried out using a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, in lotion, gel, cream, ointment, oil, solution, suspension, emulsion or other viscous composition. In some embodiments, the patient is administered at least one additional active ingredient. In some embodiments, the administration is carried out as a multiple dose regimen. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 2 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 3 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 4 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 5 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 6 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 7 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 14 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 21 days. In some embodiments, the multiple dose regimen is a time period of up to about one month. In some embodiments, the multiple dose regimen is a time period of up to about two months. Other time periods may be used herein.

In some embodiments, the administration is carried out one or more times per day. In some embodiments, the administration is carried out one time per day. In some embodiments, the administration is carried out two times per day. In some embodiments, the administration is carried out three times per day. In some embodiments, the administration is carried out four times per day.

The present disclosure also provides a method of treating otitis externa in a patient in need thereof. In some embodiments, the method comprises administering an effective amount of a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, to the patient. As used herein, the term “otitis externa” refers to an infection of the external ear canal of a patient.

In some embodiments, the patient is a human. In some embodiments, the administration is topical administration directly into the patient's external ear canal. In some embodiments, the administration is carried out using a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, in a liquid solution, suspension, lotion, paste, gel, cream, ointment, oil or other viscous composition. In some embodiments, the patient is administered at least one additional active ingredient. In some embodiments, the administration is carried out as a multiple dose regimen. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 7 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 14 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 21 days. In some embodiments, the multiple dose regimen is a time period of up to about one month. Other time periods may be used herein.

In some embodiments, the administration is carried out one or more times per day. In some embodiments, the administration is carried out one time per day. In some embodiments, the administration is carried out two times per day. In some embodiments, the administration is carried out three times per day. In some embodiments, the administration is carried out four times per day.

The present disclosure also provides a method of treating bacterial vaginosis in a patient in need thereof. In some embodiments, the method comprises administering an effective amount of a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, to the patient. As used herein, the term “bacterial vaginosis” refers to an infection of the vagina of a patient caused by an overgrowth of bacteria naturally found in the vagina.

In some embodiments, the patient is a female human. In some embodiments, the administration is topical administration. In some embodiments, the administration is carried out using a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, in a lotion, gel, cream, ointment, oil, solution, suspension, emulsion or other viscous composition. In some embodiments, the patient is administered at least one additional active ingredient. In some embodiments, the administration is carried out as a multiple dose regimen. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 7 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 14 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 21 days. In some embodiments, the multiple dose regimen is a time period of up to about one month. Other time periods may be used herein.

In some embodiments, the administration is carried out one or more times per day. In some embodiments, the administration is carried out one time per day. In some embodiments, the administration is carried out two times per day. In some embodiments, the administration is carried out three times per day. In some embodiments, the administration is carried out four times per day.

The present disclosure also provides a method of treating impetigo in a patient in need thereof. In some embodiments, the method comprises administering an effective amount of a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, to the patient. As used herein, the term “impetigo” refers an infection of the skin of a patient that results in vesicles, pustules, yellowish crusts, and the like.

In some embodiments, the patient is a human. In some embodiments, the administration is topical administration. In some embodiments, the administration is carried out using a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, in a lotion, gel, cream, ointment, oil, solution, suspension, emulsion or other viscous composition. In some embodiments, the patient is administered at least one additional active ingredient. In some embodiments, the administration is carried out as a multiple dose regimen. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 2 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 3 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 4 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 5 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 6 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 7 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 14 days. In some embodiments of the present disclosure, the multiple dose regimen is a time period of up to about 21 days. In some embodiments, the multiple dose regimen is a time period of up to about one month. Other time periods may be used herein.

In some embodiments, the administration is carried out one or more times per day. In some embodiments, the administration is carried out one time per day. In some embodiments, the administration is carried out two times per day. In some embodiments, the administration is carried out three times per day. In some embodiments, the administration is carried out four times per day.

The present disclosure also provides a kit. In some embodiments, the kit comprises a compound according to the present disclosure, or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition according to the present disclosure. As used herein, the term “kit” refers to any manufacture, such as, for example, a package, container, and the like, containing a compound according to the present disclosure, or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition according to the present disclosure. In some embodiments, a compound according to the present disclosure, or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition according to the present disclosure is packaged in a vial, bottle, tube, flask or patch, which may be further packaged within a box, envelope, bag, or the like. In some embodiments, a compound according to the present disclosure, or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition according to the present disclosure is approved by the U.S. Food and Drug Administration or similar regulatory agency in the U.S. or a jurisdiction or territory outside the U.S. for administration to a patient. In some embodiments, the kit includes written instructions for use and/or other indication that a compound according to the present disclosure, or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition according to the present disclosure is suitable or approved for administration to a patient. In some embodiments, a compound or composition of the present disclosure is packaged in unit dose or single unit dose form, such as, for example, single unit dose pills, capsules or the like. In some embodiments, the kit includes a dispenser.

The present disclosure also provides the use of a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, for the manufacture of a medicament. As used herein, the term “medicament” refers to a pharmaceutical composition according to the present disclosure. In some embodiments, the pharmaceutical composition is contained in any manufacture, such as, for example, a package, container, and the like.

In addition to the aspects and embodiments described and provided elsewhere in the present disclosure, the following non-limiting list of embodiments are also contemplated.

1. A compound having the formula:

or a pharmaceutically acceptable salt thereof.

2. The pharmaceutically acceptable salt of the compound according to clause 1 selected from the group consisting of an ammonium salt, a calcium salt, a sodium salt, a potassium salt, a magnesium salt, and a cobalt salt.

3. The pharmaceutically acceptable salt according to clause 2, wherein the ammonium salt is ammonium ((2R,3 S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-3-((butoxyoxidophosphor-yl)oxy)tetrahydrofuran-2-yl)methyl butyl phosphate.

4. The pharmaceutically acceptable salt according to clause 2, wherein the calcium salt is calcium ((2R,3S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-3-((butoxyoxidophosphor-yl)oxy)tetrahydrofuran-2-yl)methyl butyl phosphate.

5. The pharmaceutically acceptable salt according to clause 2, wherein the sodium salt is sodium ((2R,3 S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-3-((butoxyoxidophosphor-yl)oxy)tetrahydrofuran-2-yl)methyl butyl phosphate.

6. The pharmaceutically acceptable salt according to clause 2, wherein the potassium salt is potassium ((2R,3 S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-3-((butoxyoxidophosphor-yl)oxy)tetrahydrofuran-2-yl)methyl butyl phosphate.

7. The pharmaceutically acceptable salt according to clause 2, wherein the magnesium salt is magnesium ((2R,3 S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-3-((butoxyoxidophosphor-yl)oxy)tetrahydrofuran-2-yl)methyl butyl phosphate.

8. The pharmaceutically acceptable salt according to clause 2, wherein the cobalt salt is cobalt ((2R,3 S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-3-((butoxyoxidophosphor-yl)oxy)tetrahydrofuran-2-yl)methyl butyl phosphate.

9. The compound according to any one of clauses 1 to 8, or a pharmaceutically acceptable salt thereof, wherein the compound, or a pharmaceutically acceptable salt thereof, is a protonated compound having a pH when dissolved in water of about pH 3 to about pH 5.

10. The compound according to any one of clauses 1 to 9, or a pharmaceutically acceptable salt thereof, wherein the compound, or a pharmaceutically acceptable salt thereof, is a protonated compound having a pH when dissolved in water of about pH 3 to about pH 4.

11. A pharmaceutical composition comprising a compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, and one or more pharmaceutically acceptable carriers, excipients, or diluents.

12. The pharmaceutical composition of clause 11, wherein the pharmaceutical composition includes at least one additional active ingredient.

13. The pharmaceutical composition of clause 11 or clause 12, wherein the pharmaceutical composition is a human pharmaceutical composition.

14. The pharmaceutical composition of any one of clauses 11 to 13, wherein the pharmaceutical composition is adapted for topical administration.

15. The pharmaceutical composition of any one of clauses 11 to 14, wherein the pharmaceutical composition is administered in the form of a lotion, gel, cream, ointment, oil, solution, suspension, emulsion or other viscous composition.

16. The pharmaceutical composition of any one of clauses 11 to 15, wherein the pharmaceutical composition is administered in the form of a gel including a polyhydric alcohol.

17. The pharmaceutical composition of any one of clauses 11 to 13, wherein the pharmaceutical composition is adapted for oral administration.

18. The pharmaceutical composition of clause 17, wherein the pharmaceutical composition is administered in the form of a capsule, tablet, powder, liquid suspension, solution, elixir, syrup or concentrated drop.

19. The pharmaceutical composition of any one of clauses 11 to 13, wherein the pharmaceutical composition is adapted for inhalation administration.

20. The pharmaceutical composition of clause 19, wherein the pharmaceutical composition is administered in the form of a dry powder, solution, suspension or aerosol.

21. The pharmaceutical composition of any one of clauses 11 to 13, wherein the pharmaceutical composition is adapted for intravesical administration.

22. The pharmaceutical composition of clause 21, wherein the pharmaceutical composition is administered via a catheter.

23. The pharmaceutical composition of any one of clauses 11 to 13, wherein the pharmaceutical composition is adapted for parenteral administration.

24. The pharmaceutical composition of clause 23, wherein the pharmaceutical composition is administered via a needle.

25. A method of treating an infection of a diabetic foot ulcer in a patient in need thereof, the method comprising administering an effective amount of a compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, to the patient.

26. The method of clause 25, wherein the administration is topical administration.

27. The method of clause 25 or clause 26, wherein the administration is carried out using the compound, or a pharmaceutically acceptable salt thereof, in a lotion, paste, gel, cream, ointment, oil or other viscous composition.

28. The method of any one of clauses 25 to 27, wherein the administration is carried out using the compound, or a pharmaceutically acceptable salt thereof, in a gel.

29. The method of any one of clauses 25 to 28, wherein the patient is administered at least one additional active ingredient.

30. The method of any one of clauses 25 to 29, wherein the patient is a human.

31. The method of any one of clauses 25 to 30, wherein the administration is carried out as a multiple dose regimen.

32. The method of clause 31, wherein the multiple dose regimen is a time period of up to about one month.

33. The method of clause 31, wherein the multiple dose regimen is a time period of up to about two months.

34. The method of clause 31, wherein the multiple dose regimen is a time period of up to about three months.

35. The method of clause 31, wherein the multiple dose regimen is a time period of up to about four months.

36. The method of any one of clauses 25 to 35, wherein the administration is carried out one time per day.

37. A method of treating a complicated urinary tract infection in a patient in need thereof, the method comprising administering an effective amount of a compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, to the patient.

38. The method of clause 37, wherein the urinary tract infection is a catheter-associated urinary tract infection.

39. The method of clause 37 or clause 38, wherein the administration is intravesical administration.

40. The method of any one of clauses 37 to 39, wherein the administration is carried out using the compound, or a pharmaceutically acceptable salt thereof, in a liquid solution or suspension.

41. The method of any one of clauses 37 to 40, wherein the patient is administered at least one additional active ingredient.

42. The method of any one of clauses 37 to 41, wherein the patient is a human.

43. The method of any one of clauses 37 to 42, wherein the administration is carried out as a multiple dose regimen.

44. The method of clause 43, wherein the multiple dose regimen is a time period of up to about 2 days.

45. The method of clause 43, wherein the multiple dose regimen is a time period of up to about 3 days.

46. The method of clause 43, wherein the multiple dose regimen is a time period of up to about 4 days.

47. The method of clause 43, wherein the multiple dose regimen is a time period of up to about 5 days.

48. The method of clause 43, wherein the multiple dose regimen is a time period of up to about 6 days.

49. The method of clause 43, wherein the multiple dose regimen is a time period of up to about 7 days.

50. The method of clause 43, wherein the multiple dose regimen is a time period of up to about 14 days.

51. The method of any one of clauses 37 to 41, wherein the administration is carried out as a chronic treatment regimen.

52. The method of any one of clauses 37 to 51, wherein the administration is carried out one time per day.

53. A method of treating a lung infection arising from cystic fibrosis in a patient in need thereof, the method comprising administering an effective amount of a compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, to the patient.

54. The method of clause 53, wherein the administration is inhalation administration.

55. The method of clause 53 or 54, wherein the administration is carried out using the compound, or a pharmaceutically acceptable salt thereof, in a dry powder, solution, suspension or aerosol.

56. The method of any one of clauses 53 to 55, wherein the patient is administered at least one additional active ingredient.

57. The method of any one of clauses 53 to 56, wherein the patient is a human.

58. The method of any one of clauses 53 to 57, wherein the administration is carried out as a multiple dose regimen.

59. The method of clause 58, wherein the multiple dose regimen is a time period of up to about one month.

60. The method of clause 58, wherein the multiple dose regimen is a time period of up to about two months.

61. The method of clause 58, wherein the multiple dose regimen is a time period of up to about three months.

62. The method of clause 58, wherein the multiple dose regimen is a time period of up to about four months.

63. The method of clause 58, wherein the multiple dose regimen is a time period of up to about five months.

64. The method of clause 58, wherein the multiple dose regimen is a time period of up to about six months.

65. The method of clause 58, wherein the multiple dose regimen is a time period of up to about seven months.

66. The method of clause 58, wherein the multiple dose regimen is a time period of up to about eight months.

67. The method of any one of clauses 53 to 58, wherein the administration is carried out one time per day.

68. A method of treating ventilator acquired pneumonia in a patient in need thereof, the method comprising administering an effective amount of a compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, to the patient.

69. The method of clause 68, wherein the administration is inhalation administration.

70. The method of clause 68 or clause 69, wherein the administration is carried out using the compound, or a pharmaceutically acceptable salt thereof, in a liquid solution, suspension or dry powder.

71. The method of any one of clauses 68 to 70, wherein the patient is administered at least one additional active ingredient.

72. The method of any one of clauses 68 to 71, wherein the patient is a human.

73. The method of any one of clauses 68 to 72, wherein the administration is carried out as a multiple dose regimen.

74. The method of clause 73, wherein the multiple dose regimen is a time period of up to about 7 days.

75. The method of clause 73, wherein the multiple dose regimen is a time period of up to about 14 days.

76. The method of clause 73, wherein the multiple dose regimen is a time period of up to about 21 days.

77. The method of clause 73, wherein the multiple dose regimen is a time period of up to about one month.

78. The method of any one of clauses 68 to 73, wherein the administration is carried out one time per day.

79. A method of treating an infection in a burn wound in a patient in need thereof, the method comprising administering an effective amount of a compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, to the patient.

80. The method of clause 79, wherein the administration is topical administration.

81. The method of clause 79 or 80, wherein the administration is carried out using the compound in a lotion, gel, cream, ointment, oil, solution, suspension, emulsion or other viscous composition.

82. The method of any one of clauses 79 to 81, wherein the patient is administered at least one additional active ingredient.

83. The method of any one of clauses 79 to 82, wherein the patient is a human.

84. The method of any one of clauses 79 to 83, wherein the administration is carried out as a multiple dose regimen.

85. The method of clause 84, wherein the multiple dose regimen is a time period of up to about 2 days.

86. The method of clause 84, wherein the multiple dose regimen is a time period of up to about 3 days.

87. The method of clause 84, wherein the multiple dose regimen is a time period of up to about 4 days.

88. The method of clause 84, wherein the multiple dose regimen is a time period of up to about 5 days.

89. The method of clause 84, wherein the multiple dose regimen is a time period of up to about 6 days.

90. The method of clause 84, wherein the multiple dose regimen is a time period of up to about 7 days.

91. The method of clause 84, wherein the multiple dose regimen is a time period of up to about 14 days.

92. The method of clause 84, wherein the multiple dose regimen is a time period of up to about 21 days.

93. The method of clause 84, wherein the multiple dose regimen is a time period of up to about one month.

94. The method of any one of clauses 84 to 93, wherein the administration is carried out one or more times per day.

95. The method of any one of clauses 84 to 94, wherein the administration is carried out one time per day.

96. The method of any one of clauses 84 to 94, wherein the administration is carried out two times per day.

97. The method of any one of clauses 84 to 94, wherein the administration is carried out three times per day.

98. The method of any one of clauses 84 to 94, wherein the administration is carried out four times per day.

99. A method of treating otitis externa in a patient in need thereof, the method comprising administering an effective amount of a compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, to the patient.

100. The method of clause 99, wherein the administration is topical administration directly into the patient's external ear canal.

101. The method of clause 99 or clause 100, wherein the administration is carried out using the compound in a lotion, gel, cream, ointment, oil, solution, suspension, emulsion or other viscous composition.

102. The method of any one of clauses 99 to 101, wherein the patient is administered at least one additional active ingredient.

103. The method of any one of clauses 99 to 102, wherein the patient is a human.

104. The method of any one of clauses 99 to 103, wherein the administration is carried out as a multiple dose regimen.

105. The method of clause 104, wherein the multiple dose regimen is a time period of up to about 7 days.

106. The method of clause 104, wherein the multiple dose regimen is a time period of up to about 14 days.

107. The method of clause 104, wherein the multiple dose regimen is a time period of up to about 21 days.

108. The method of clause 104, wherein the multiple dose regimen is a time period of up to about one month.

109. The method of any one of clauses 99 to 108, wherein the administration is carried out one or more times per day.

110. The method of any one of clauses 99 to 109, wherein the administration is carried out one time per day.

111. The method of any one of clauses 99 to 109, wherein the administration is carried out two times per day.

112. The method of any one of clauses 99 to 109, wherein the administration is carried out three times per day.

113. A method of treating bacterial vaginosis in a patient in need thereof, the method comprising administering an effective amount of a compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, to the patient.

114. The method of clause 113, wherein the administration is topical administration.

115. The method of clause 113 or clause 114, wherein the administration is carried out using the compound in a lotion, gel, cream, ointment, oil, solution, suspension, emulsion or other viscous composition.

116. The method of any one of clauses 113 to 115, wherein the administration is carried out using a gel.

117. The method of any one of clauses 113 to 116, wherein the patient is administered at least one additional active ingredient.

118. The method of any one of clauses 113 to 117, wherein the patient is a female human.

119. The method of any one of clauses 113 to 118, wherein the administration is carried out as a multiple dose regimen.

120. The method of clause 119, wherein the multiple dose regimen is a time period of up to about 7 days.

121. The method of clause 119, wherein the multiple dose regimen is a time period of up to about 14 days.

122. The method of clause 119, wherein the multiple dose regimen is a time period of up to about 21 days.

123. The method of any one of clauses 113 to 122, wherein the administration is carried out one or more times per day.

124. The method of any one of clauses 113 to 123, wherein the administration is carried out one time per day.

125. A method of treating impetigo in a patient in need thereof, the method comprising administering an effective amount of a compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, to the patient.

126. The method of clause 125, wherein the administration is topical administration.

127. The method of clause 125 or clause 126, wherein the administration is carried out using the compound in a lotion, gel, cream, ointment, oil, solution, suspension, emulsion or other viscous composition.

128. The method of any one of clauses 125 to 127, wherein the administration is carried out using a gel.

129. The method of any one of clauses 125 to 128, wherein the patient is administered at least one additional active ingredient.

130. The method of any one of clauses 125 to 129, wherein the patient is a human.

131. The method of any one of clauses 125 to 130, wherein the administration is carried out as a multiple dose regimen.

132. The method of clause 131, wherein the multiple dose regimen is a time period of up to about 2 days.

133. The method of clause 131, wherein the multiple dose regimen is a time period of up to about 3 days.

134. The method of clause 131, wherein the multiple dose regimen is a time period of up to about 4 days.

135. The method of clause 131, wherein the multiple dose regimen is a time period of up to about 5 days.

136. The method of clause 131, wherein the multiple dose regimen is a time period of up to about 6 days.

137. The method of clause 131, wherein the multiple dose regimen is a time period of up to about 7 days.

138. The method of clause 131, wherein the multiple dose regimen is a time period of up to about 14 days.

139. The method of clause 131, wherein the multiple dose regimen is a time period of up to about 21 days.

140. The method of any one of clauses 125 to 139, wherein the administration is carried out one or more times per day.

141. The method of any one of clauses 125 to 140, wherein the administration is carried out one time per day.

142. The method of any one of clauses 125 to 141, wherein the administration is carried out two times per day.

143. A kit comprising the compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition according to any one of clauses 11 to 24.

144. A compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, for use in therapy.

145. A compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, for use in the treatment of an infection of a diabetic foot ulcer.

146. A compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, for use in the treatment of a complicated urinary tract infection.

147. A compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, for use in the treatment of a lung infection arising from cystic fibrosis.

148. A compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, for use in the treatment of ventilator acquired pneumonia.

149. A compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, for use in the treatment of an infection in a burn wound.

150. A compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, for use in the treatment of otitis externa.

151. A compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, for use in the treatment of bacterial vaginosis.

152. A compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, for use in the treatment of impetigo.

153. The use of a compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, for the manufacture of a medicament.

154. A method of coating a catheter with a compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof, the method comprising coating the catheter with the compound, or a pharmaceutically acceptable salt thereof, prior to inserting the catheter into a patient.

155. A composition comprising a catheter coated with a compound according to any one of clauses 1 to 10, or a pharmaceutically acceptable salt thereof.

EXAMPLES

Examples related to the present disclosure are described below. In most cases, alternative techniques can be used. The examples are intended to be illustrative and are not limiting or restrictive of the scope of the invention as set forth in the claims.

Example 1 Synthesis of Nu-8

Step-1. Protection of the Amine (Building Block Key Intermediate)

Cytidine 2a is added to hexamethyldisilazane (HMDS), 4-(dimethylamino)pyridine (DMAP), trimethylsilyl trifluoromethanesulfonate, and di-tert-butyl dicarbonate ((BOC)₂O) in methanol to protect the nitrogen atoms of 2a by generating BOC-protected compound Int-2.

Step-2. Preparation of Phosphitylating Reagent (Building Block Key Intermediate)

n-Butanol is reacted with the phosphinamide 1 in THF with tetrazole as a catalyst in the presence of N,N-diisopoylethylamine (DIEA). The crude product is chromatographed on neutral alumina eluting with hexane and then 2% ethyl acetate in hexane. The pure fractions is combined (by TLC) and evaporated to a residue under vacuo.

Step-3. Coupling of Key Intermediates

BOC-protected species Int-2 is bis-phosphinylated with reagent 2 in dichloromethane (DCM)/dimethyl formamide (DMF) solvent and tetrazole as catalyst to produce 3. The reaction mixture is concentrated to a residue and the crude product is immediately oxidized in the next step.

Steps 4 &5. Oxidation and Amino Deprotection

The crude product 3 is oxidized with tert-butylhydroperoxide (TBTH) in the presence of decane to generate the bis-phosphonate species 4. Removal of the BOC groups is carried in DCM in the presence of trifluoroacetic acid (TFA) to yield 5. The crude product is chromatographed on silica gel eluting with ethyl acetate. The pure fractions (by TLC) are combined and evaporated to a residue under vacuo.

Step-6. Deprotection of the Phosphodiester

Hydrolysis of 5 with methanolic ammonium hydroxide (NH₄OH, MeOH) gives crude (I) ammonium salt (6).

Steps 7 & 8. Purification

Purification by preparative HPLC of 6 and conversion to the free acid with Dowex 50WX8-200 resin is carried out. Evaporation of the aqueous eluate provides (I) that is diluted with purified water to provide a 20% solution at its ambient pH.

Example 2 Synthesis of Nu-8 Sodium Salt

Synthesis of Compound-2

To a solution of compound-1 (1.0 kg, 3.3222 mol) in THF (6 L) is added DIEA (1.370 mL, 8.3055 mol) and tetrazole (230 g, 3.3222 mol) followed by n-butanol (275 mL, 2.99 mol) in THF (6 L) is added drop wise at 0° C. for 12 h. The reaction mixture is stirred at room temperature for 24 h. The progress of the reaction is monitored by TLC and after completion of the reaction, solid is filtered off. Filtrate is evaporated under reduced pressure at 40° C. to afford crude compound. Crude compound is dissolved in ethyl acetate (5 L). Organic layer is washed with water (3 L) and brine (2 L). Organic layer is dried over anhydrous Na₂SO₄ filtered and the solvent is evaporated under reduced pressure to obtain crude compound. The crude compound is purified by column chromatography over basic lumina (Al₂O₃), Compound eluted with 0-2% EtOAc in petroleum ether to afford Compound-2. (700 g, 76.92%) as pale yellow liquid. H-NMR (400 MHz, chloroform-d) δ 4.18-4.07 (m, 1H), 4.02 (q, J=6.6 Hz, 1H), 3.93-3.74 (m, 4H), 2.65 (td, J=6.5, 3.6 Hz, 2H), 1.31-1.23 (m, 4H), 1.18 (dd, J=6.8, 3.8 Hz, 12H), 0.93 (td, J=7.4, 3.1 Hz, 3H). LC-MS: 275 (M+H).

Synthesis of Compound-4

To solution of compound-3 (300 g, 1.321 mol) in hexamethyldisilazane (638 g, 3.964 mol) is added DMAP (16.11 g, 0.132 mol) followed by TMSOTf (7.22 g, 0.039 mol) is added at 0° C. and the resulting reaction mixture is stirred for 1 h at room temperature. After complete of starting material Boc-anhydride (1.4 L, 6.605 mol) is added at 0° C. for 1 h and the reaction mixture is stirred for 16 h at room temperature. To the reaction is added methanol (3 L) followed by triethylamine (1.5 L) is added at 0° C. for 1 h and the reaction mixture is stirred for 20 h at room temperature. Reaction mixture is concentrated under reduced pressure to get crude compound. Crude compound is diluted with ethyl acetate (3 L) and washed with water (1.0 L) and brine (1.0 L) solution; organic layer is dried over anhydrous Na₂SO₄, filtered and the solvent is evaporated under reduced pressure to get afford crude compound. The crude compound is purified by column chromatography silica gel (100-200 mesh) compound eluted 0-3% MeOH in DCM to afford Compound-4 (180 g, 31.89%) as off white solid. H-NMR (300 MHz, DMSO-d6) δ 8.41 (d, J=7.5 Hz, 1H), 6.84 (d, J=7.5 Hz, 1H), 6.06 (t, J=6.2 Hz, 1H), 5.28 (d, J=4.3 Hz, 1H), 5.07 (q, J=4.6, 4.0 Hz, 1H), 4.21 (q, J=4.1 Hz, 1H), 3.87 (q, J=3.7 Hz, 1H), 3.71-3.49 (m, 2H), 2.32 (m, 1H), 2.03 (dt, J=13.0, 6.2 Hz, 1H), 1.49 (s, 18H). LC-MS: 275 (M+H).

Synthesis of Compound-6

To a stirred solution of compound-4 (180 g, 0.421 mol) in THF (1.0 L) is added DIEA (348 mL, 2.105 mol) and tetrazole (176 g, 2.526 mol) at 0° C. To the resulting reaction mixture is added a solution of compound-2 (519 g, 1.896 mol) in THF (800 mL) drop wise at 0° C. for 1 h. The reaction mixture is stirred at room temperature for 16 h. After completion of the reaction, tert-butyl peroxide in decane (505 mL, 5 M) is added drop wise at 0° C. and the reaction mixture is stirred for 6 h at room temperature. The reaction is monitored by TLC. After completion of the reaction, the reaction mixture is concentrated at 40° C. and diluted with ethyl acetate (3 L) and washed with water (1 L) and brine (1 L) solution. Organic layer is dried over anhydrous Na₂SO₄ filtered and the solvent is evaporated under reduced pressure to get afford crude compound (350 g crude). The crude compound is purified by column chromatography through silica gel (100-200 mesh) column eluted with 0-5% MeOH in DCM. All collected pure fractions are concentrated to afford pure Compound-6 (220 g, 64.83%) as a wine red liquid. H-NMR (300 MHz, DMSO-d6) δ 8.19 (dd, J=7.6, 1.3 Hz, 1H), 6.88 (d, J=7.5 Hz, 1H), 6.13 (t, J=10.5 Hz, 1H), 4.99 (s, 1H), 4.44 (s, 1H), 4.26-3.96 (m, 10H), 3.00-2.84 (m, 4H), 2.57-2.79 (m, 2H), 1.70-1.54 (m, 4H), 1.50 (s, 18H), 1.35 (m, 4H), 0.88 (qd, J=7.5, 2.5 Hz, 6H); LC-MS: 806 (M+H).

Synthesis of Compound-7

To a solution of Compound-6 (220 g, 0.273 mol) in DCM (4.4 L) is added TFA (210 mL, 2.732 mol) dropwise at 0° C. The reaction mixture is stirred at room temperature for 24 h. The reaction is monitored by TLC. After completion of the reaction, solvent is evaporated under reduced pressure to afford crude compound. The crude compound is purified by column chromatography silica gel (230-400 mesh). Compound eluted with 0-10% MeOH in DCM. All collected pure fractions are concentrated to afford pure Compound-7 (170 g, 84.67%) as a pale yellow liquid. H-NMR (300 MHz, DMSO-d6) δ 7.61 (d, J=7.5 Hz, 1H), 7.27 (d, J=13.9 Hz, 2H), 6.19 (t, J=6.9 Hz, 1H), 5.74 (d, J=7.4 Hz, 1H), 4.96 (s, 1H), 4.10-3.93 (m, 11H), 2.93 (q, J=6.2 Hz, 4H), 2.29 (d, J=13.1 Hz, 2H), 1.61 (h, J=7.1 Hz, 4H), 1.35 (p, J=7.3 Hz, 4H), 0.89 (dq, J=7.9, 4.2 Hz, 6H); LC-MS: 606 (M+H).

Synthesis of Nu-8

To a stirred solution of Compound-7 (720 g, 1.1900 mol) in MeOH (5.0 L) is added aq. ammonia (600 mL) at 0° C. The reaction mixture is stirred at room temperature for 4 h. The reaction is monitored by TLC. After completion of the reaction, evaporate the MeOH under reduced pressure the aqueous layer is washed with DCM (1.5 L). The aqueous layer is passed through Dowex-H⁺ resin. The water is removed under reduced pressure to afford Nu-8 (260 g, 43.84%) as an off white solid. H-NMR (300 MHz, DMSO-d6) δ 8.94 (s, 1H), 8.49 (s, 1H), 7.97 (d, J=7.8 Hz, 1H), 6.08 (t, J=6.1 Hz, 1H), 5.95 (d, J=7.7 Hz, 1H), 4.76 (q, J=5.8 Hz, 1H), 4.15 (q, J=4.1 Hz, 1H), 4.08 (s, 1H), 3.83 (m, 6H), 2.43 (t, J=5.6 Hz, 2H), 1.67-1.44 (m, 4H), 1.44-1.26 (m, 4H), 0.95-0.82 (m, 6H), LC-MS: 500.15 (M+H).

Synthesis of Nu-8 Sodium Salt

To a stirred solution of compound-Nu-8 (260 g, 0.478 mol) in water (2.6 L), 1 N NaOH (950 mL) is added dropwise at 0° C. The reaction mixture is stirred at room temperature for 2 h. The reaction is monitored by TLC. After completion of the reaction, aqueous layer is washed with DCM (1.5 L). The aqueous layer is evaporated under reduced pressure to afford Nu-8 sodium salt (265 g, 93%) as off white solid. H-NMR (300 MHz, DMSO-d6) δ 7.81 (d, J=7.2 Hz, 1H), 7.2 (bs, 1H), 7.0 (bs, 1H), 6.16 (t, J=4 Hz, 1H), 5.71 (d, J=7.6 Hz, 1H), 4.69 (bs, 1H), 3.75 (m, 1H), 3.71 (m, 1H), 3.8 (m, 4H), 2.2 (q, 1H), 1.89-1.96-1.44 (m, 1H), 1.49-1.39 (m, 4H), 1.34-1.23 (m, 4H), 0.88-0.84 (m, 6H).

Example 3 Comparative Physical Property Studies of Bisphosphocin® Compounds Nu-2, Nu-4, and Nu-5, and the Compound of Formula (I)

The structures of known Bisphosphocin® compounds Nu-2, Nu-4, and Nu-5 are shown below:

pH studies are conducted to show the pH of Nu-8 compared to Bisphosphocin® compounds Nu-2, Nu-4, and Nu-5. 20 mg/mL Nu-2 solution is prepared by diluting 2 mL of 250 mg/mL Nu-2 solution with 23 mL DI water. 20 mg/mL Nu-4 and Nu-5 solutions are prepared in the same way. 401.65 mg Nu-8 is weighed in a 5 mL volumetric flask and diluted with DI water to volume. 20 mg/mL Nu-8 solution is prepared by diluting 5 mL of 80.3 mg/mL Nu-8 solution with 15 mL DI water. The pH values of 4 Nu-2, Nu-4, Nu-5, and Nu-8 at 20 mg/mL are measured with a calibrated pH meter. The results are shown in TABLE 1. Also shown in TABLE 1 is a summary of other physical properties of the compound of Formula (I) and reference compounds Nu-2, Nu-4, and Nu-5.

TABLE 1 Nu-2 Nu-4 Nu-5 Nu-8 pH (2% solution) 0.99 0.94 0.93 1.49 pKa 2.30 2.30 2.28 3.20 Solubility — — — 137 Pow 0.0407 0.0592 0.0480 0.0662

Nu-8 prepared in a 2% aqueous solution provides the most basic (highest pH) solution compared to reference compounds Nu-2, Nu-4, and Nu-5. Without wishing to be bound to any particular theory, it is believed that the presence of a free exocyclic amino group in the structure of Nu-8 alters the pH of Nu-8 in solution, which in turn caused Nu-8 to act more rapidly and to be more potent at higher pH levels than Bisphosphocins® Nu-2, Nu-4, and Nu-5.

Additionally, pKa measurements show that Nu-8 has the lowest acid dissociation constant compared to Bisphosphocins® Nu-2, Nu-4, and Nu-5, which is a measurement of the dissociation of the molecule in to hydrogen ion(s) and corresponding conjugate base. Without wishing to be bound to any particular theory, it is believed that Nu-8 does not have as many acidic protons in its structure that can dissociate into solution as hydrogen ions compared to the number of acidic protons present in reference Bisphosphocin® compounds Nu-2, Nu-4, and Nu-5. The reference Bisphosphocins® compounds have acidic protons such as hydroxyl protons and methyl ester protons, which can dissociate into solution.

In summary, Nu-8 prepared in a 2% aqueous solution provides the most basic (highest pH) solution and acts more rapidly and is more potent at higher pH levels compared to reference compounds Nu-2, Nu-4, and Nu-5.

Example 4 Use of Nu-8 in the Treatment of Helicobacter Pylon in Mice Animals

The mouse strain used in this study is C57/BL6 ranging from 5-6 weeks in age and 18-22 grams in weight. Mice are housed five to a cage with free access to food and water in accordance with NIH guidelines.

Bacterial Strain

A bacterial strain of Helicobacter pylori SS1 (CagA+, VacA+) is adapted for the mouse model from a human clinical isolate and validated in this infection model.

Infection

At 6 days prior to infection, a frozen stock is streaked onto one to two Columbia 5% sheep blood agar plates, and the plates are microaerophilically incubated for 72 hours at 37° C. After 72 hours, the plate growth is subcultured onto five Columbia 5% sheep blood agar plates and is incubated as before. After another 72 hours of incubation, the plates are removed, and the plate growth is suspended in sterile 0.9% saline to an OD of 1.5-2.0 at 530 nm. This OD is approximately equal to 1.0e+09 CFU/mL, which is used to orally infect the mice on all 3 infection days. To infect mice, the mice are orally dosed 0.25 mL of the 1.0e+09 CFU/mL via a 20-22 G gavage needle. Mice need to be fasted only before the first infection.

Treatment

At 1 week post-infection, mice are treated with Nu-8. Multiple dose antibiotic therapies are administered orally at 0.2 mL/dose. Antibiotics are administered 2 times per day and continued for 7 days. The control group is administered the vehicle alone.

Sampling

Food is removed from cages 18 hours prior to euthanizing animals and each cage is clearly labeled that the animals are being experimentally fasted. Mice are euthanized (CO₂ & cervical dislocation). After mice are euthanized, each stomach is removed by cutting the esophagus away from the superior aspect of the stomach and the duodenum away from the pyloric region. The excised stomach is placed into a sterile petri dish and the luminal contents are rinsed away with sterile 1×PBS. Each rinsed stomach is placed into a 14-mL Falcon tube containing 2 mL of 1×PBS and stored on ice. Each stomach is homogenized, 10-fold serial diluted in 1×PBS, spot plated onto Columbia agar with 3.5% laked horse blood±the DENT selective antibiotic supplement, and microaerophilically incubated for 5 days at 37° C. Then, colonies are counted.

Dose Response

Nu-8 is administered at various doses (mg/kg), orally, twice-a-day for 7 days. The formulations, concentration and dose volumes for treatment is established prior to dosing. The positive control group consists of a triple therapy regimen (omeprazole, amoxicillin, and clarithromycin). Negative control used dosing solution without drugs. The doing schedule is shown in TABLE 2. The inoculation and treatment schedule is shown in TABLE 3.

TABLE 2 Conc Dose Group Compound Dose Volume Regimen # animals^(a) 1 Nu-8 0.2 mg 1 mg/mL, PO; bid × 16 0.2 mL 7 days 2 1.0 mg 5 mg/mL, 16 0.2 mL 3 2.0 mg 10 mg/mL, 16 0.2 mL 4 PrevPac 31 mg/kg 31 mg/kg bid × 7 days 16 5 Vehicle na na bid × 7 days 5 6 Infection na na bid × 7 days 20 controls ^(a)8 animals each for therapeutic and relapse endpoints

TABLE 3 Day Procedure −11 Infection −10 −9 Infection −8 −7 Infection 0 Treatment & Control sample 1 2 3 Treatment 4 5 6 7 Day 7 sample 14 Day 14 sample

Results

Mice are infected on three days with inoculums of 6.16, 6.6 and 6.37 _(log10) CFU. One week following the last infection (Day 0—treatment initiated) mean stomach titers are 6.74 _(log10) CFU. Counts remain consistent over the next two weeks with mean titers for the untreated control groups of 6.86 and 6.66 _(log10) CFU on days 7 and 14, respectively (see TABLE 4, which shows mean bacterial stomach titers of H. pylori SS1 in mice following treatment with Nu-8 and Prevpac). Nu-8 exhibits a dose response with bacterial stomach tiers of 5.62, 5.21, and 4.74 on Day 7 and 6.2, 5.67, and 5.81 _(log10) CFU on Day 14 for the dose solutions of 1, 5, and 10 mg/mL, respectively. Prevpac (e.g., clarithromycin, omeprazole and Amoxicillin) reduces bacterial titers to 3.22 _(log10) CFU on Day 7 which rebounds to 6.19 _(log10) CFU by Day 14. Although treatment with Nu-8 is less effective than the triple therapy regimen on Day 7, Nu-8 exhibits less of a rebound by Day 14 (7 days after the last administered dose) than Prevpac with lower counts for the 5 and 10 mg/mL dose groups (see TABLE 4). In summary, these results support the use of Nu-8 as a longer term treatment of H. pylori infections, which such results would be expected against other gram negative bacteria.

TABLE 4 Conc Group Test Dose Dose Vol Regimen Time-points Log10 SD 1 Cp, [pim (I) 0.2 mg 1 mg/mL, PO, bid for  +7 Days 5.62 0.6 0.2 mL 7 days +14 Days 6.2 0.86 2 1.0 mg 5 mg/mL, PO, bid for  +7 Days 5.21 0.26 0.2 mL 7 days +14 Days 5.67 0.23 3 2 mg 10 mg/mL, PO, bid for  +7 Days 4.74 0.68 0.2 mL 7 days; +14 Days 5.81 0.74 4 PREVPAC 31 mg/kg 31 mg/kg PO, bid for  +7 Days 3.22 0.52 7 days +14 Days 6.19 0.69 5 Vehicle na na PO, bid for  +7 Days 6.59 0.12 Treated 7 days Day 0 6.74 0.37 6 Untreated na na na Controls na  +7 Days 6.86 0.54 na +14 Days 6.66 0.76

Example 5 Bacterial Cytological Profiling for Assessing Structure Activity Relationship of Nu-8 Compared with Bisphosphocin® Compounds Nu-3, Nu-4, and Nu-5

The structure of known Bisphosphocin® compound Nu-3 is shown below:

Methods and Materials

This bacterial cytological profiling (BCP) study uses methods and materials described previously by Nonejuie, P., Burkart, M., Poglianoa, K., Pogiano, J. (2013). Bacterial cytological profiling rapidly identifies the cellular pathways targeted by antibacterial molecules. Proc. Natl. Acad. Sci. U.S.A. 110(40):16169-16174. doi: 10.1073/pnas.1311066110.

Wild type strains of E. coli ATCC 25922 or P. aeruginosa K2732 are grown in rich media (unbuffered 2× Lysogeny broth [LB]) at 30 C to an OD₆₀₀˜0.4. These cultures are then split and each sample treated with the appropriate concentration of Nu-8 in unbuffered or buffered LB (final mixture OD₆₀₀˜0.1). Cells exposed without Nu-8 are buffered to pH 4 with phosphoric acid.

The BCP is performed in LB media buffered to pH 4. The minimum inhibitory concentration (MIC) is measured for Nu-3, Nu-4, Nu-5, and Nu-8 against each bacterial strain. As one of ordinary skill in the art understands, minimum inhibitory concentrations are the lowest concentration of an antimicrobial that will inhibit the visible growth of a microorganism after overnight incubation. Cells are treated with each of Nu-3, Nu-4, Nu-5, and Nu-8 at three different concentrations (1, 0.5, and 0.25×MIC) and samples are collected at 30 min and 2 and 4 h for imaging. Cellular viability is assayed at three time points (5 minutes and 4 and 24 h following the onset of treatment).

For imaging E. coli, treated cells are stained with 1 μg/mL FM4-64, 2 μg/mL DAPI, and 0.5 μM SYTOXGreen (Molecular Probes/Invitrogen). P. aeruginosa samples are stained 0.5 μM SYTOX Green, 28 μg/mL DAPI, and 4.5 μg/mL FM 4-64. Cells are transferred to an agarose pad (20% LB, 1% agarose) for imaging as described in Pogliano, J., Osborne, N., Sharp, M. D., Abanes-De Mello, A., Perez, A., Sun, Y.-L. and Pogliano, K. (1999), A vital stain for studying membrane dynamics in bacteria: a novel mechanism controlling septation during Bacillus subtilis sporulation. Molecular Microbiology, 31: 1149-1159. doi:10.1046/j 0.1365-2958.1999.01255.x.

Results

The BCP results indicate that each of Nu-3, Nu-4, Nu-5, and Nu-8 affect the cell envelope in both E. coli (ATCC 25922) and P. aeruginosa (K2732). Treatment with Nu-3, Nu-4, Nu-5, and Nu-8 causes DNA condensation at higher treatment concentrations (buffered pH 4) for E. coli (ATCC 25922). Nu-4, Nu-5, and Nu-8 increase cell membrane permeability (buffered pH 4 or in unbuffered LB) for both E. coli (ATCC 25922) and P. aeruginosa (K2732), while Nu-3, Nu-4, and Nu-5 cause cell wall deformations (unbuffered LB) for E. coli (ATCC 25922). Treatment with Nu-8 manifests rapid and marked reduction in cell viability and is superior in effect to Nu-3, Nu-4, and Nu-5. Specifically, Nu-8 reduces cell viability to <10² CFU/mL within minutes from an initial CFU/mL of 10⁹. Nu-3, Nu-4 and Nu-5 also reduce CFU/mL to <10²⁻³ at a slower rate within hours of treatment.

In summary, these results support the use of Nu-8 in treatment of infection in which a fast acting antimicrobial mechanism is preferred, such as, for example, urinary tract infections and bacterial infections associated with diabetic foot ulcers, among others.

Example 6 Bisphosphocin® Compounds Nu-3 and Nu-5 and Nu-8 Antimicrobial Efficacy at Incremental pH Increases Against E. coli and P. aeruginosa

MIC testing is conducted using the broth (Mueller Hinton Broth) microdilution procedures relevant to each organism group as established by the Clinical and Laboratory Standards Institute (CLSI; 3-7). MIC plates are prepared in accordance with CLSI (3-7). To prepare the test plates, automated liquid handlers are used to conduct serial dilutions and liquid transfers. Automated liquid handlers utilized in this study include the Multidrop 384 (Labsystems, Helsinki, Finland) and the Biomek 2000 (Beckman Coulter, Fullerton Calif.). The solution is diluted to desired pH using 1 M Citric Acid or 1 M NaOH buffer. A standardized inoculum of each test organism is prepared per CLSI methods (3, 5-7) to equal a 0.5 McFarland standard in the appropriate media followed by an additional 1:20 dilution (1:10 for anaerobes).

The plates are then inoculated with 10 μL of the diluted 0.5 McFarland suspension using the Biomek 2000 from low to high drug concentration, resulting in a final concentration of approximately 5×10⁵ CFU/mL per well. An un-inoculated plate is incubated for the purpose of assessing solubility of the drug in the test media. The plates are stacked 3 to4 high, covered with a sterile lid on the top plate, and incubated for 18 to 24 hours according to CLSI. The MIC is recorded as the lowest concentration of respective compound that inhibited visible growth of the organism.

As demonstrated in TABLE 5, Nu-8 MIC efficacy is greater than Bisphosphocin® Compounds Nu-3 and Nu-5 at equivalent pH against E. coli and P. aeruginosa. Specifically, Nu-8 antimicrobial activity is better than Nu-3 and Nu-5 in pH range (pH 3-4) deemed important for clinical use in several administration routes, such as, for example, topical, inhalation, and intravesical.

TABLE 5 pH 1 pH 3 pH 4 pH 5 pH 7 (MIC) mg/mL E. coli Nu-3 12.5 >100 — >100 >100 Nu-5 6.25 100 — 100 100 Nu-8 9.8 37.5 75 >75 >75 P. aeruginosa Nu-3 12.5 >100 — >100 >100 Nu-5 6.25 100 — 100 100 Nu-8 9.38 18.75 37.5 75 >75

Example 7 Bacterial Cytological Profiling of Nu-3 Versus Nu-8 Against Gram Negative and Gram Positive Bacteria at pH 4, 5.5, and 7 Methods and Materials

This bacterial cytological profiling (BCP) investigation uses methods and materials described previously by Nonejuie, P., Burkart, M., Poglianoa, K., Pogiano, J. (2013). Bacterial cytological profiling rapidly identifies the cellular pathways targeted by antibacterial molecules. Proc. Natl. Acad. Sci. U.S.A. 110(40):16169-16174. doi: 10.1073/pnas.1311066110.

For viable cell counts, cells are grown to OD₆₀₀≈0.4 and diluted 1:1 into buffered or unbuffered media containing various compound concentrations. Samples are then collected and serially diluted (1:10) on a 96 well plate. Five microliters from each well are spotted on LB plates, incubated at 30° C., and viable cells are counted the next day.

Samples are collected at 10, 30, 120, and 240 min of exposure for viable cell count and imaging. For imaging, E. coli and S. aureus 200 μL of treated cells per time point are stained with 0.8 μg/mL FM4-64, 1.5 μg/mL DAPI, and 0.4 μM SYTOXGreen (Molecular Probes/Invitrogen). P. aeruginosa samples are stained 0.4 μM SYTOX Green, 28 μg/mL DAPI, and 1 μg/mL FM 4-64. Cells are transferred to an agarose pad (20% LB, 1% agarose) for imaging.

For Nu-3 and Nu-8 stocks (at pH 4, 5.5 and 7), stock concentration is 500 mg/mL. For pH 4, the stocks are prepared by dissolving Nu-3 in 25 mM citrate buffer and Nu-8 in 350 mM citric acid. For pH 5.5, the stocks are prepared by dissolving Nu-3 in 25 mM citric-phosphate and Nu-8 in 25 mM critic. For pH 7, the stocks are prepared by dissolving Nu-3 and Nu-8 in 25 mM Sorensen phosphate buffer. 2×LB (lysogeny broth) solutions are prepared with 50 mM citrate buffer for pH 4, 50 mM citrate-phosphate buffer for pH 5.5, and 50 mM Sorensen phosphate buffer for pH 7.

Results

Under the experimental conditions of BCP procedure performed at pH 4 and above, Nu-8 is more effective than Nu-3 (at equimolar concentrations) against wild type E. coli (ATCC 25922), wild type P. aeruginosa (PAO1; K2732), and methicillin susceptible S. aureus (ATCC 29213) in rapidly altering cell viability, cell growth, and cell permeability over a range of exposure times, concentrations, and in buffered media (Linnaeus Bioscience 10-2-2017 Report). E. coli in culture at pH 4, 5.5, and 7 without treatment is unaffected. E. coli cell growth, cell viability, and cell permeability up to 24 h of the study remain consistent relative to similar parameters assayed at neutral pH. At pH 4, Nu-8 is more effective than Nu-3 at similar concentrations (112.5 and 225 mg/mL) markedly decreasing cell viability within 10 min of treatment (cell viability decreases from log 10⁷ CFU/mL to <log 10³ CFU/mL), whereas Nu-3 at 112.5 mg/mL slows cell growth during 240 min of treatment leading to lower cell viability at 24 h (cell growth delay up to 240 min 10⁷ CFR/mL [pH 4 alone, cell growth at 240 min 10⁸ CFU/mL] decreases to 10^(4.5) CFU/mL by 24 h), and at 225 mg/mL reduces cell viability within 240 min (<10³ CFU/mL). Cell viability occurs before apparent changes in cell permeability are detected at 10 min of treatment. At pH 5.5 and 7, Nu-8 alters E. coli cell permeability and reduces cell viability and growth whereas Nu-3 is ineffective.

P. aeruginosa at pH 4 alone is rapidly affected with reduced cell growth and viability and increased maximal 100% cell permeability (within 10 to 30 min of treatment). At pH 5.5 and 7 alone, cell growth and cell viability, and cell permeability are unaffected (relative to similar parameters assayed at neutral pH). Nu-3 and Nu-8 at pH 4 are generally additive in effect to that observed at pH 4 alone and reduce cell viability. Nu-8 at 56.5 mg/mL is more effective in reducing cell viability (<10³ CFU/mL) within 30 min relative to Nu-3 at twice the concentration (112.5 mg/mL), which reduces cell viability within 120 min (<10³ CFU/mL). At 112.5 mg/mL, Nu-8 lowers cell viability within 10 min (<10³ CFU/mL) beyond that occurring with a similar Nu-3 treatment as well as with pH 4 alone (˜10⁶ CFU/mL by 10 min). Also at pH 5.5 and 7, Nu-8 at 112.5 mg/mL is more active causing <20% increase in cell permeability and reduction in cell growth relative to Nu-3 at 112.5 mg/mL, which produces little change in cell permeability (<6%) and no effect on cell growth. At pH 7, only Nu-8 (225 mg/mL) increases cell permeability (˜37% with 10 min) which subsequently is not persistent and cell growth is slightly lower than that at pH 7 alone.

S. aureus at pH 4 alone exhibits reduced cell growth and cell viability and a slight increase in cell permeability (<8%). At pH 5.5 alone, cell growth is inhibited up to 240 min and later recovered by 24h and cell permeability is unaffected. At pH 7, all cell parameters are unaffected. At pH 4, Nu-8 at 125 mg/mL slightly increases cell permeability (<4.3%) with enhanced killing activity (10³ CFU/mL by 240 min from 10⁷⁵ CFU/mL at study start, and <10³ CFU/mL at 24 h) compared to cell viability at pH 4 alone (˜10⁷ CFU/mL at 240 min and 10⁴ CFU/mL at 24 h). Nu-3 at 125 mg/mL produces low cell permeability (<10%) and slight reduction in cell growth resembling that at pH 4 alone. At 250 mg/mL, Nu-8 reduces cell viability within 10 min (˜10⁴ CFU/mL) without recovery later (<10³ CFU/mL) and increases cell permeability (˜60%). Nu-3 at 250 mg/mL is less active producing a slight increase in cell permeability (<10%) with reduced cell viability within 240 min to 24 h (<10³ CFU/mL). At pH 5.5 and 7, both Nu-3 and Nu-8 (125 mg/mL and 250 mg/mL) slightly reduce cell growth up to 24 h with minimal effect on cell permeability (<5%).

In summary, this study demonstrates that Nu-8 will outperform Nu-3 across a pH range 3-4 planned for clinical use.

Example 8 Nu-8 Antimicrobial Activity Against Strain Commonly Associated with Bacteria

Bacterial strains evaluated in this study include Escherichia coli, Klebsiella spp, Serratia marcescens, Proteus mirabilis/vulgaris, Citrobacter spp, Providencia spp, Morganella morganii, Pseudomonas aeruginosa, Staphylococcus aureus (MRSA only), and Enterococcus faecalis. Nu-8 test solutions are adjusted to pH 3.5 with citric acid, and MCI is evaluated per the CLSI methods in Mueller-Hinton broth supplemented accordingly to facilitate growth of specific strains.

MICs of the Nu-8 at pH 3.5 are measured in human and mouse urine and are comparable to those of Nu-8 in Mueller Hinton broth under similar conditions. TABLE 6 demonstrates Nu-8 MIC against the bacterial strains identified therein.

TABLE 6 Nu-8 MIC (mg/mL) at pH 3.5 Test Organisms (# of isolates) (MIC₅₀ and MIC₉₀) Gram-negative Escherichia coli (5) 37.5 Klebsiella pneumoniae (5) (includes 37.5-75   Serratia marcescens (5) 37.5-75   Proteus mirabilis/vulgaris (5)  4.69-18.75 Citrobacter species (5) 18.75-37.5  Providencia species (5) 9.38-37.5 Morganella morganii (5) 18.75 Haemophilus influenzae (5) 4.69-9.38 Other Pseudomonas aeruginosa (20) 9.38-18.75 (18.75 and 18.75) Gram-positive Staphylococcus aureus (20) (MRSA 9.38-37.5 (18.75 and 37.5) Enterococcus faecalis (5) (both VSE  4.69-18.75 Streptococcus pneumoniae (PRSP)  9.38-18.75

The MICs are also determined using lysogeny broth (LB) at pH 4 as the growth medium. Under these conditions, Nu-8 is active against E. coli and P. aeruginosa with MICs of 54 and 27 mg/mL, respectively.

In summary, these results demonstrate that Nu-8 is effective against gram negative and gram positive bacteria, which is deemed important for clinical use in several administration routes, such as, for example, topical, inhalation, and intravesical.

Example 9 Initial Efficacy Evaluation of Nu-8 Against Escherichia Coli in a Urinary Tract Infection Model in BALB/c Mice

Female BALB/c mice (20-22 g) ordered from Envigo are acclimated to housing conditions and handled in accordance with Animal Use Protocol (AUP) number TP-08. Animals are fed irradiated Teklad Global 29 18 Rodent Diet and water ad libitum. Mice are housed 6/cage in static cages with irradiated ⅛″ Teklad corn cobbedding 7902 inside bioBubble® clean rooms that provide H.E.P.A filtered air into the bubble environment at 100 complete air changes per hour. The environment is controlled to a temperature range of 74°±4° F. and a humidity range of 30-70%. All procedures carried out in this experiment are conducted in compliance with the laws, regulations, and guidelines of the National Institutes of Health and with the approval of the TransPharm Preclinical Solutions Animal Care and Use Committee.

A clinical isolate of Escherichia coli (strain CFT073, TPPS 1041) are procured from the University of Michigan.

The organism is grown overnight at 37° C. in ambient atmosphere on trypticase soy agar plates supplemented with 5% sheep blood cells. The culture is aseptically swabbed and transferred to tubes of trypticase soy broth. The optical density is determined at 600 nm. The culture is diluted to provide an inoculum of approximately 7.5 log₁₀ CFU per mouse in a volume of 30 μL. Instillation of the bacterial challenge constituted time 0 hour for the study. Inoculum counts are estimated before inoculation by optical density and confirmed after inoculation by dilution and back counts.

One hour prior to bacterial challenge, water is removed from animal cages. On Day 0 at 0 hours, mice are anesthetized using isoflurane and urine is expressed from the bladder by applying gentle pressure to the abdomen with the thumb. Mice are infected with bacteria via transurethral injection in a volume of 30 μL. Water is returned to the cages immediately following the challenge. Challenge is performed in a BL2 surgical suite. The final count of the challenge inoculum demonstrated a delivered burden of 7.8 log₁₀ organisms per mouse.

Nu-8 (Test article) is prepared immediately before each dosing. Nu-8 is dissolved in sterile saline and adjusted to pH 3.5 with phosphoric acid. At 23 hours post-challenge, water is removed from animal cages. One hour later, mice are anesthetized using isoflurane and residual urine is expressed from the bladder. Mice are treated with test article or controls via transurethral dosing in a volume of 30 μL according to TABLE 7 (showing Animal Challenge and Treatment Schedule). Harvest time is the time when the mice organs are processed. All treatments are administered in a BSL2 surgical suite. Immediately following treatment administration, the urethral opening is occluded using a cyanoacrylate tissue ad.

TABLE 7 Challenge Treatment E. Dose Dose Harvest Grp N Coli ROA Description ROA (mg/kg) Time Time^(a) 1 6 7.5 Transurethral Saline pH Transurethral NA 24 hr 60 min log₁₀ 3.5 2 Gentamicin 50 60 min 3 Nu-8 pH 3.5 1025 20 min 4 Nu-8 pH 3.5 1025 60 min ^(a)Relative to challenge at 0 hour

The primary endpoint used to assess progress of the infection is mean bacterial burden per gram of urinary bladder tissue. At 60 or 20 minutes following treatment administration and urethral occlusion, mice are euthanized by CO₂ asphyxiation. The urinary bladder is aseptically removed, weighed, and homogenized in 1 mL TSB using a mini bead-beater. The resulting homogenate is serially diluted (neat to 10-7) and grown overnight at ° C. on ambient atmosphere trypticase soy agar plates supplemented with 5% sheep blood cells. Colony forming units (CFU) are enumerated and the total bacterial burden per gram of urinary bladder tissue homogenate is calculated.

The geometric mean CFU, along with standard error of the mean (SEM), are calculated using Microsoft Excel and bar charts are prepared for the data using GraphPad Prism v. 7.0. Statistical comparisons are made between groups by comparing the geometric mean bacterial burden of different treatment groups in Excel, using a Student's t-test assuming unequal variance. Two-tailed P-values <0.05 are considered significant.

At 60 minutes post-treatment, vehicle-treated mice in Group 1 demonstrated an average bladder CFU burden of 5.3 log₁₀, while gentamicin-treated animals in Group 2 showed 6.1 log₁₀ CFU. At 20 minutes post-treatment, mice treated with Nu-8 showed a significant decrease in mean bladder CFU burden (2.9 log₁₀) when compared to the vehicle-treated control group. At 60 minutes, these mice showed a burden of 3.7 log₁₀ CFU.

In summary, Nu-8 showed a statistically significant decrease in E. coli in animal bladders in 20 minutes post-treatment, which confirms Nu-8 is effective against E. Coli in a urinary tract infection animal model. These results are a predictive model for human therapies.

Example 10 Confirmatory Efficacy Evaluation of Nu-8 Against Escherichia Coli in a Urinary Tract Infection Model in BALB/c Mice

Female BALB/c mice (20-22 g) ordered from Envigo are acclimated to housing conditions and handled in accordance with Animal Use Protocol (AUP) number TP-08. Animals are fed irradiated Teklad Global 29 18 Rodent Diet and water ad libitum. Mice are housed 6/cage in static cages with irradiated ⅛″ Teklad corn cobbedding 7902 inside bioBubble® clean rooms that provide H.E.P.A filtered air into the bubble environment at 100 complete air changes per hour. The environment is controlled to a temperature range of 74°±4° F. and a humidity range of 30-70%. All procedures carried out in this experiment are conducted in compliance with the laws, regulations, and guidelines of the National Institutes of Health and with the approval of the TransPharm Preclinical Solutions Animal Care and Use Committee.

A clinical isolate of Escherichia coli (strain CFT073, TPPS 1041) are procured from the University of Michigan.

The organism is grown overnight at 37° C. in ambient atmosphere on trypticase soy agar plates supplemented with 5% sheep blood cells. The culture is aseptically swabbed and transferred to tubes of trypticase soy broth. The optical density is determined at 600 nm. The culture is diluted to provide an inoculum of approximately 7.5 log₁₀ CFU per mouse in a volume of 30 μL. Instillation of the bacterial challenge constituted time 0 hour for the study. Inoculum counts are estimated before inoculation by optical density and confirmed after inoculation by dilution and back counts.

One hour prior to bacterial challenge, water is removed from animal cages. On Day 0 at 0 hours, mice are anesthetized using isoflurane and urine is expressed from the bladder by applying gentle pressure to the abdomen with the thumb. Mice are infected with bacteria via transurethral injection in a volume of 30 μL. Water is returned to the cages immediately following the challenge. Challenge is performed in a BL2 surgical suite. The final count of the challenge inoculum demonstrated a delivered burden of 7.8 log₁₀ organisms per mouse.

Nu-8 (Test article) is prepared immediately before each dosing. Nu-8 is dissolved in sterile saline and adjusted to pH 3.5 with phosphoric acid. At 23 hours post-challenge, water is removed from animal cages. One hour later, mice are anesthetized using isoflurane and residual urine is expressed from the bladder. Mice are treated with test article or controls via transurethral dosing in a volume of 30 μL according to TABLE 8 (showing Animal Challenge and Treatment Schedule). All treatments are administered in a BSL2 surgical suite.

Immediately following treatment administration, the urethral opening is occluded using Locktite gel superglue. One drop of glue is placed at the urethral opening and the opening is held together for 5-10 seconds using tissue forceps to ensure the urethral opening is occluded and the adhesive is dry. Animals remained under anesthetic following urethral occlusion. Mice are rotated (front to back) every 5 minutes while under anesthesia.

TABLE 8 Challenge Treatment E. Dose Dose Harvest Grp N Coli ROA Description ROA (mg/kg) Time Time^(a) 1 6 7.5 Transurethral PBS pH 3.5 Transurethral NA 24 hr 20 min 2 log₁₀ Nu-8 pH 3.5 205 20 min 3 Nu-8 pH 3.5 410 20 min 4 Nu-8 pH 3.5 820 10 min 5 Nu-8 pH 3.5 820 20 min ^(a)Relative to challenge at 0 hour

The primary endpoint used to assess progress of the infection is mean bacterial burden per gram of urinary bladder tissue. At 10 or 20 minutes following treatment administration and urethral occlusion, mice are euthanized by CO₂ asphyxiation. The abdominal cavity is dissected to expose the bladder and the urethra is clamped near the bladder to prevent urine leakage. Care is taken not to express urine from the bladder during removal by cutting the urethra distal to the lamp. The bladder (with urine) is aseptically removed and transferred to a pre-weighed vial with 1 mL TSB. The bladder is then cut to release urine into the vial along with the tissue. The tissue is weighed and homogenized using a mini-bead beater. The resulting homogenate is serially diluted (neat to 10-7), plated in 5 μL duplicate spots, and grown overnight at 37° C. in ambient atmosphere on trypticase soy agar plates supplemented with 5% sheep blood cells. The undiluted (neat) homogenate is also plated in 100 μL volume for each sample. Colony forming units (CFU) are enumerated and the total bacterial burden per gram of urinary bladder tissue homogenate is calculated.

The geometric mean CFU, along with standard error of the mean (SEM), are calculated using Microsoft Excel, and bar charts are prepared for the data using GraphPad Prism v.7.0. Statistical comparisons are made between groups by comparing the geometric mean bacterial burden of different treatment groups in Excel, using a Student's t-test assuming unequal variance. Two-tailed P-values <0.05 are considered significant.

At 10 minutes post-treatment, animals treated with 820 mg/kg Nu-8 showed an average bladder CFU burden of 6.3 log 10.

At 20 minutes post-treatment, vehicle-treated mice in Group 1 demonstrated an average of 6.8 log 10 CFU/g tissue. Mice which received Nu-8 at 205, 410, and 820 mg/kg showed bacterial burdens of 6.5, 5.0, and 5.4 log 10, respectively.

In summary, Nu-8 showed a decrease in E. coli in animal bladders in 20 minutes post-treatment, which confirms Nu-8 is effective against E. Coli in a urinary tract infection animal model. These results are a predictive model for human therapies.

Example 11 Urinary Tract Infection (UTI) Model in Rats Induced by Escherichia coli with Transurethral Treatment

Female Sprague-Dawley rats (n=6/group) are intraurethrally infected with the pre-determined inoculum size of E. coli. At the specified time following infection with (depending on the in vivo growth curve), the animals are anaesthetized (ketamine/xylazine) and treated by transurethral administration with neutral saline (group 1), saline pH 3.5 adjusted with phosphoric acid (group 2), test compound Nu-8 pH 3.5 at 103 and 207 mg/kg (groups 3 and 4, respectively). When adjusting pH, the volume of phosphoric acid added are monitored and the final concentration of the pH adjusted dose solution are subsequently determined. The goal is to have the final concentration after pH adjustment within 10% of the desired dose so the final concentration after pH adjustment are reported. Volume of administration will be 300 μL. TABLE 9 (Animal Challenge and Treatment Schedule) summarizes the study groups.

TABLE 9 Terminal procedures Treatment (urine Inoculum size 4 hrs post sampling CFU/300 μL/rat 2nd infection directly Group (E. coli ATCC25922) (300 μL from No N 1^(st) Infection 2^(nd) Infection intraurethrally) bladder) 1 10 1 × 10⁸ 1 × 10⁸ Control saline 60 minutes neutral pH post 2 10 Control saline treatment pH 3.5 3 10 Nu-8 pH 3.5; 103 mg/kg 4 10 Nu-8 pH 3.5; 207 mg/kg

Two hours prior to each infection animals are water deprived. Each animal is infected twice with 24 hrs difference by transurethral administration of 300 μL of bacterial suspension under light ketamine and xylazine anaesthesia. Prior to infection, urine is evacuated by digital pressure, cannula is gently inserted into the bladder via urethra, and 300 μL of bacterial suspension is inserted into the bladder. After infection cannula is gently removed, the animal is held in upside down position for 1 min, then placed into a cage.

Animals from all groups are sacrificed by exsanguination on K2EDTA anticoagulant (under ketamine/xylazine anaesthesia) 60 minutes following treatment, and urine are sampled under sterile conditions for CFU determination.

The mean CFU log 10 per mL of bladder tissue (tissue plus urine) per group was 5.67, 5.53 and 4.60 Log 10 CFUs/mL bladder tissue for pH 3.5 solutions of saline, and Nu-8 doses of 103 mg/kg and 207 mg/kg at 60 min, respectively. The Log 10 CFUs/mL bladder tissue for saline control at pH 7 was 5.51. Statistically significant reduction in CFU counts is observed in group treated with Nu-8 at a dose of 207 mg/kg BW as compared to saline pH3.5 control group. There is no statistically significant difference in CFU counts between groups treated with Nu-8 and saline pH 7 control group.

In summary, this rat study confirms the mouse studies shown in in EXAMPLES 9 and 10, all of which demonstrate that Nu-8 shows a statistically significant decrease in E. coli in animal bladders in 20 minutes post-treatment. The results of this study again confirms that Nu-8 is effective against E. Coli in a urinary tract infection animal model. These results are a predictive model for human therapies.

Example 12 Nu-8 Treatment of Human Patient Having Complicated Urinary Tract Infection

A human patient is identified as having a complicated urinary tract infection. A pharmaceutical composition in the form of a liquid solution containing an effective amount of Nu-8 is administered intravesically to the patient via a catheter. The patient is monitored until symptoms are alleviated or ameliorated, and the pharmaceutical composition may be administered one or more additional times if it is determined that such administration is necessary or helpful for treatment.

Example 13 Nu-8 Treatment of Human Patient Having a Lung Infection Arising from Cystic Fibrosis

A human patient is identified as having a lung infection arising from cystic fibrosis. A pharmaceutical composition in the form of a liquid solution containing an effective amount of Nu-8 is administered inhalationally to the patient via a nebulizer. The patient is monitored until symptoms are alleviated or ameliorated, and the pharmaceutical composition may be administered one or more additional times if it is determined that such administration is necessary or helpful for treatment.

Example 14 Nu-8 Treatment of Human Patient Having an Infection of a Diabetic Foot Ulcer

A human patient is identified as having a diabetic foot ulcer. A pharmaceutical composition in the form of a gel containing an effective amount of Nu-8 is administered topically to the patient at the location of the diabetic foot ulcer. The patient is monitored until symptoms are alleviated or ameliorated, and the pharmaceutical composition may be administered one or more additional times if it is determined that such administration is necessary or helpful for treatment.

Example 15 Nu-8 Treatment of Human Patient Having Ventilator Acquired Pneumonia

A human patient is identified as having ventilator acquired pneumonia. A pharmaceutical composition in the form of a liquid solution containing an effective amount of Nu-8 is administered inhalationally to the patient via a nebulizer. The patient is monitored until symptoms are alleviated or ameliorated, and the pharmaceutical composition may be administered one or more additional times if it is determined that such administration is necessary or helpful for treatment.

Example 16 Nu-8 Treatment of Human Patient Having an Infection in a Burn Wound

A human patient is identified as having an infection in a burn wound. A pharmaceutical composition in the form of a gel containing an effective amount of Nu-8 is administered topically to the patient at the location of the burn wound. The patient is monitored until symptoms are alleviated or ameliorated, and the pharmaceutical composition may be administered one or more additional times if it is determined that such administration is necessary or helpful for treatment.

Example 17 Nu-8 Treatment of Human Patient Having Impetigo

A human patient is identified as having impetigo. A pharmaceutical composition in the form of a gel containing an effective amount of Nu-8 is administered topically to the patient at the location of the vesicles, pustules and/or yellowish crusts. The patient is monitored until symptoms are alleviated or ameliorated, and the pharmaceutical composition may be administered one or more additional times if it is determined that such administration is necessary or helpful for treatment.

Example 18 Nu-8 Treatment of Human Patient Having Otitis Externa

A human patient is identified as having otitis externa. A pharmaceutical composition in the form of a liquid solution containing an effective amount of Nu-8 is administered topically directly into the patient's external ear canal. The patient is monitored until symptoms are alleviated or ameliorated, and the pharmaceutical composition may be administered one or more additional times if it is determined that such administration is necessary or helpful for treatment.

Example 19 Nu-8 Treatment of Female Human Patient Having Bacterial Vaginosis

A female human patient is identified as having bacterial vaginosis. A pharmaceutical composition in the form of a gel containing an effective amount of Nu-8 is administered topically onto or into the patient's vagina. The patient is monitored until symptoms are alleviated or ameliorated, and the pharmaceutical composition may be administered one or more additional times if it is determined that such administration is necessary or helpful for treatment.

Example 20 Nu-8 Treatment of Human Patient Having an Infection of an Ulcer

A human patient is identified as having an ulcer. A pharmaceutical composition in the form of a gel containing an effective amount of Nu-8 is administered topically to the patient at the location of the ulcer. The patient is monitored until symptoms are alleviated or ameliorated, and the pharmaceutical composition may be administered one or more additional times if it is determined that such administration is necessary or helpful for treatment.

Example 21 Nu-8 Treatment of Human Patient Having an Infection in a Wound

A human patient is identified as having an infection in a wound. A pharmaceutical composition in the form of a gel containing an effective amount of Nu-8 is administered topically to the patient at the location of the wound. The patient is monitored until symptoms are alleviated or ameliorated, and the pharmaceutical composition may be administered one or more additional times if it is determined that such administration is necessary or helpful for treatment.

Example 22 Efficacy Evaluation of Nu-8 Formulated in Saline Solution or Hydrogel Against Staphylococcus aureus in a Murine Dermal Infection Model Introduction

SKH-1 hairless mice have the outer layer of skin cells removed by stripping with 7 applications and removals of surgical tape. Immediately following tape stripping, mice receive a topical inoculation of methicillin resistant Staphylococcus aureus (USA300) at a targeted challenge of 6.0 log₁₀ CFU. Four hours following challenge, mice are treated with test articles or vehicle controls, and at two hours following treatment, mice have skin harvested for CFU burden enumeration.

Skin Preparation

SKH-1 mice are obtained from Charles River Laboratories. The age of the mice on Day 0 is approximately 6-8 weeks. Only female mice are selected for the study. Animals are handled in accordance with AUP number TP-18. Mice are housed in solid-bottom micro-isolator cages on stainless steel racks. Animals are fed irradiated Teklad Global 2918 Rodent Diet and water ad libitum. Bedding is provided in the form of irradiated Teklad ⅛″ corn cob bedding 7902. Animals are maintained in a bioBubble® Clean Room which provides H.E.P.A filtered air into the bubble environment at 100 complete air changes per hour. The environment is controlled to a temperature range of 74°±5° F. and a humidity range of 30-70%. Fluorescent lighting provides illumination for 12 hours per day. Mice are acclimated for a minimum of 24 hours prior to study start. The animals are observed for general health and acceptability for use in this study. Only animals deemed healthy are included in this study.

On Day 0 immediately prior to infection, each mouse is anesthetized using isoflurane and the dorsal area receives 7 applications and removals of Nexcare™ (3M) surgical tape in order to remove the outermost epidermal layer of skin.

Challenge

The challenge microorganimsm is prepared. Methicillin resistant Staphylococcus aureus (USA300) is grown overnight at 37° C. at ambient atmosphere trypticase soy agar plates supplemented with 5% sheep blood cells. The culture is aseptically swabbed and transferred to tubes sterile water until optical density reaches approximately 0.75 at 600 nm. The cultures are diluted to provide challenge inoculate of 6.0 log₁₀ CFU per mouse in a volume of 100 μL. Inoculum count is estimated before inoculation by optical density and confirmed after inoculation by dilution and back count.

As mentioned above, the final count of the challenge inoculum demonstrates a delivered burden of 6.0 log₁₀ organisms per mouse. On Day 0 at 0 hours, animals are anesthetized using isoflurane, brought to a surgical plane, and infected with bacteria via topical application, spread in the tape stripped area of approximately 0.75″×0.75″. Challenge is allowed to dry slightly before mice are brought out of anesthesia.

Formulation and Dosing

The test articles are prepared in a manner to minimize endotoxin and bacterial contamination. A 10% (100 mg/mL) solution of Nu-8 is prepared in 0.9% sterile saline. A 20% Nu-8 solution for 50/50 mixture in a hydrogel vehicle (for 10% final Nu-8 concentration) is made using sterile water. Citric acid is used to adjust the solutions to pH 3.5. The test articles are stored at 4° C.

A 0.9% sterile saline adjusted to pH 3.5 with citric acid is prepared as a vehicle/negative control and stored at room temperature. A hydrogel vehicle adjusted to pH 3.5 with citric acid is prepared as another vehicle/negative control. The hydrogel vehicle is prepared by mixing equal volumes of hydrogel and 0.9% sterile saline with final pH of the mixture adjusted to pH 3.5.

At exactly four hours following challenge, mice in Groups 2-5 receive a topical application of Nu-8 (in either saline or hydrogel vehicle), saline vehicle, or gel vehicle, in a volume of 100 spread on the dorsal area previously stripped and inoculated with bacteria. Mice in Group 1 do not receive treatment. Mice are housed individually following treatment until harvest time.

Endpoint Analysis

Mice are observed at least twice daily during the study period and are randomly assigned to experimental groups as shown in TABLE 10. At the time indicated in TABLE 10, mice are humanely euthanized via CO₂ overexposure. Mice are harvested at 6 hours post challenge (2 hours post-treatment).

Following euthanasia, a section of excised skin approximately 0.5″×0.5″ is aseptically removed from the infected/treated area and transferred to vials with 2.0 mL of sterile water and weighed. Tissues are allowed to set at room temperature for 10 minutes. Tissue pH is measured using litmus paper and recorded. All tissues have pH of 5.0 or 5.5. Following pH measurement, tissues are homogenized using a bead beater. The homogenate is serially diluted from neat to 10⁻⁷ and plated in duplicate 5 μL spots onto trypticase soy agar plates supplemented with 5% sheep blood cells. 100 μL of the undiluted (neat) homogenate is plated for each sample. Plates are incubated overnight at 37° C. in ambient atmosphere. Colony forming units (CFU) are tabulated for each treatment per gram of skin tissue and efficacy is determined by comparison to the vehicle matched controls.

TABLE 10 USA300 Challenge log₁₀ Topical Treatment Skin Group CFU Route Description Schedule ^(a) Harvest^(a) 1 6.0 Topical Untreated NA 6 hr 2 6.0 Topical Saline Vehicle 4 hr 6 hr (pH 3.5) 3 6.0 Topical Hydrogel Control 4 hr 6 hr (pH 3.5) 4 6.0 Topical Nu-8 10% Solution 4 hr 6 hr (pH 3.5) 5 6.0 Topical Hydrogel 10% Nu-8 4 hr 6 hr mixture (pH 3.5) ^(a) Treatment and Harvest times are relative to challenge time of 0 hr

Infection/Treatment/General Observations

None of the study subjects displayed any acute adverse events associated with the treatments. None of the test subjects succumbed to the infection or showed signs of morbidity, which could be attributed to penetration of the infection into the circulatory system or deep tissue. No groups displayed adverse signs beyond those expected for mice which have received a superficial dermal bacterial infection.

The untreated group CFU burden was 6.8 log₁₀ at 6 hours post challenge. The saline (pH 3.5) CFU burden was 6.5 log₁₀ at 6 hours post challenge. The hydrogel vehicle (pH 3.5) was 6.4 log₁₀ at 6 hours post challenge. At 6 hours post challenge, both Nu-8 groups (in saline and hydrogel) showed a significant decrease in CFU burden (˜1.0 log₁₀ reduction).

Referring now to FIG. 1, the bar graph shows a significant reduction in colony forming units (CFU) at two hours post treatment when comparing the saline and gel controls (column one) taken as baseline infection at approximately 300,000 CFU per square millimeter to either the Nu-8 in saline treated mice at approximately 30,000 CFU per square millimeter or the Nu-8 hydrogel treated mice at approximately 40,000 CFU per square millimeter, which is approximately a ten-fold reduction in bacteria.

Referring now to FIG. 2, the bar graph shows the same information as FIG. 1., except that the data (numbers of CFUs) are presented as log₁₀ numbers as explained below.

One of the core starting requirements, when designing infectious models to test anti-microbial therapeutics is selecting the targeted reduction of colony forming units (CFU) of the targeted microbe. Log reduction is a mathematical term that is used to express the relative number of living microbes that are eliminated by anti-microbial agents. In terms of infection control, “Log Reductions” convey how effective a product is at reducing pathogens. The greater the log reduction the more effective the product is at killing bacteria and other pathogens that can cause infections. It is not necessary to convert the CFU value to log value; however, changing the numbers to the logarithm makes it easier to see small numbers and large numbers on the same graph and to facilitate statistical analysis. For example, a 1 log reduction corresponds to inactivating 90 percent of a target microbe. The relationship between log reduction and percent reduction are as listed below:

1 log reduction=90% reduction

2 log reduction=99% reduction

3 log reduction=99.9% reduction

4 log reduction=99.99% reduction

5 log reduction=99.999% reduction

6 log reduction=99.9999% reduction

Referring now to FIG. 3, the bar graph shows the same information as FIG. 1., except that the data (numbers of CFUs) are presented as percentages. The saline/gel controls (column one) are taken as 100% infection level of the mouse wounds and the Nu-8 saline (column 2) or Nu-8 gel (column 3) are shown as a percentage reduction (90% Nu-8 saline and 87% Nu-8 gel) compared to the controls.

Together, these data demonstrate that Staphylococcus aureus establishes a robust dermal infection. When compared to hydrogel and saline treated controls, topical administration of Nu-8 in hydrogel or sterile saline significantly decreased bacterial burden at 6 hours post-challenge.

While embodiments have been disclosed hereinabove, the present invention is not limited to the disclosed embodiments. Instead, this application is intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims. 

What is claimed is:
 1. A method of treating an infection of at least one of a wound or an ulcer in a patient in need thereof, the method comprising administering to the patient an effective amount of a compound having the formula:

or a pharmaceutically acceptable salt thereof.
 2. The method of claim 1, wherein the administration is topical administration.
 3. The method of claim 1, wherein the administration is carried out using the compound, or a pharmaceutically acceptable salt thereof, in a lotion, paste, gel, cream, ointment, oil, or other viscous composition.
 4. The method of claim 1, wherein the administration is carried out using the compound, or a pharmaceutically acceptable salt thereof, in a powder, solution, or suspension.
 5. The method of claim 1, wherein the patient is administered at least one additional active ingredient.
 6. The method of claim 1, wherein the administration is carried out as a multiple dose regimen.
 7. The method of claim 6, wherein the multiple dose regimen is a time period of up to about 7 days.
 8. The method of claim 6, wherein the multiple dose regimen is a time period of up to about 14 days.
 9. The method of claim 6, wherein the multiple dose regimen is a time period of up to about 21 days or up to about one month.
 10. The method of claim 1, wherein the administration is carried out as a chronic treatment regimen.
 11. The method of claim 1, wherein the administration is carried out one or more times per day.
 12. The method of claim 1, wherein the amount of the compound, or a pharmaceutically acceptable salt thereof, administered to the patient is from about 0.1 to about 1000 milligram (mg) of the compound, or a pharmaceutically acceptable salt thereof, per kilogram (kg) of patient body weight.
 13. The method of claim 1, wherein the amount of the compound, or a pharmaceutically acceptable salt thereof, administered to the patient is from about 0.1 to about 500 mg of the compound, or a pharmaceutically acceptable salt thereof, per kg of patient body weight.
 14. The method of claim 1, wherein the amount of the compound, or a pharmaceutically acceptable salt thereof, administered to the patient is from about 0.1 to about 300 mg of the compound, or a pharmaceutically acceptable salt thereof, per kg of patient body weight.
 15. The method of claim 1, wherein the amount of the compound, or a pharmaceutically acceptable salt thereof, administered to the patient is from about 0.1 to about 200 mg of the compound, or a pharmaceutically acceptable salt thereof, per kg of patient body weight.
 16. The method of claim 1, wherein the amount of the compound, or a pharmaceutically acceptable salt thereof, administered to the patient is from about 0.1 to about 100 mg of the compound, or a pharmaceutically acceptable salt thereof, per kg of patient body weight.
 17. The method of claim 1, wherein the patient is a human.
 18. The method of claim 1, wherein the pharmaceutically acceptable salt is a sodium salt.
 19. The method of claim 18, wherein the sodium salt is sodium ((2R,3S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-3-((butoxyoxidophosphor-yl)oxy)tetrahydrofuran-2-yl)methyl butyl phosphate.
 20. The method of claim 1, wherein the wound is a burn wound.
 21. The method of claim 1, wherein the ulcer is a diabetic foot ulcer. 